199971329 has 2 divisors, whose sum is σ = 199971330. Its totient is φ = 199971328.

The previous prime is 199971313. The next prime is 199971379. The reversal of 199971329 is 923179991.

It is an a-pointer prime, because the next prime (199971379) can be obtained adding 199971329 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194658304 + 5313025 = 13952^2 + 2305^2 .

It is an emirp because it is prime and its reverse (923179991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199971329 - 2⁴ = 199971313 is a prime.

It is not a weakly prime, because it can be changed into another prime (199971379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99985664 + 99985665.

It is an arithmetic number, because the mean of its divisors is an integer number (99985665).

Almost surely, 2^199971329 is an apocalyptic number.

It is an amenable number.

199971329 is a deficient number, since it is larger than the sum of its proper divisors (1).

199971329 is an equidigital number, since it uses as much as digits as its factorization.

199971329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 275562, while the sum is 50.

The square root of 199971329 is about 14141.1219144734. The cubic root of 199971329 is about 584.7756014696.

The spelling of 199971329 in words is "one hundred ninety-nine million, nine hundred seventy-one thousand, three hundred twenty-nine".