99919949 has 2 divisors, whose sum is σ = 99919950. Its totient is φ = 99919948.

The previous prime is 99919921. The next prime is 99919951. The reversal of 99919949 is 94991999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75811849 + 24108100 = 8707^2 + 4910^2 .

It is a cyclic number.

It is not a de Polignac number, because 99919949 - 2²⁰ = 98871373 is a prime.

Together with 99919951, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99919909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49959974 + 49959975.

It is an arithmetic number, because the mean of its divisors is an integer number (49959975).

Almost surely, 2^99919949 is an apocalyptic number.

It is an amenable number.

99919949 is a deficient number, since it is larger than the sum of its proper divisors (1).

99919949 is an equidigital number, since it uses as much as digits as its factorization.

99919949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2125764, while the sum is 59.

The square root of 99919949 is about 9995.9966486589. The cubic root of 99919949 is about 464.0349956884.

The spelling of 99919949 in words is "ninety-nine million, nine hundred nineteen thousand, nine hundred forty-nine".