99939913 has 2 divisors, whose sum is σ = 99939914. Its totient is φ = 99939912.

The previous prime is 99939911. The next prime is 99939929. The reversal of 99939913 is 31993999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60964864 + 38975049 = 7808^2 + 6243^2 .

It is a cyclic number.

It is not a de Polignac number, because 99939913 - 2¹ = 99939911 is a prime.

Together with 99939911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (99939911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49969956 + 49969957.

It is an arithmetic number, because the mean of its divisors is an integer number (49969957).

Almost surely, 2^99939913 is an apocalyptic number.

It is an amenable number.

99939913 is a deficient number, since it is larger than the sum of its proper divisors (1).

99939913 is an equidigital number, since it uses as much as digits as its factorization.

99939913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 531441, while the sum is 52.

The square root of 99939913 is about 9996.9951985584. The cubic root of 99939913 is about 464.0658983521.

The spelling of 99939913 in words is "ninety-nine million, nine hundred thirty-nine thousand, nine hundred thirteen".