99611915 has 32 divisors (see below), whose sum is σ = 132632640. Its totient is φ = 71368704.

The previous prime is 99611909. The next prime is 99611917. The reversal of 99611915 is 51911699.

It is a cyclic number.

It is not a de Polignac number, because 99611915 - 2¹⁸ = 99349771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99611917) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 387467 + ... + 387723.

It is an arithmetic number, because the mean of its divisors is an integer number (4144770).

Almost surely, 2^99611915 is an apocalyptic number.

99611915 is a deficient number, since it is larger than the sum of its proper divisors (33020725).

99611915 is a wasteful number, since it uses less digits than its factorization.

99611915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431.

The product of its digits is 21870, while the sum is 41.

The square root of 99611915 is about 9980.5768871343. The cubic root of 99611915 is about 463.5576612708.

The spelling of 99611915 in words is "ninety-nine million, six hundred eleven thousand, nine hundred fifteen".