99855913 has 4 divisors (see below), whose sum is σ = 99879760. Its totient is φ = 99832068.

The previous prime is 99855883. The next prime is 99855923. The reversal of 99855913 is 31955899.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99855913 - 2¹⁷ = 99724841 is a prime.

It is a super-2 number, since 2×99855913² = 19942406722127138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99855923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3795 + ... + 14632.

It is an arithmetic number, because the mean of its divisors is an integer number (24969940).

Almost surely, 2^99855913 is an apocalyptic number.

It is an amenable number.

99855913 is a deficient number, since it is larger than the sum of its proper divisors (23847).

99855913 is a wasteful number, since it uses less digits than its factorization.

99855913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23846.

The product of its digits is 437400, while the sum is 49.

The square root of 99855913 is about 9992.7930529957. The cubic root of 99855913 is about 463.9358453339.

The spelling of 99855913 in words is "ninety-nine million, eight hundred fifty-five thousand, nine hundred thirteen".