99912331 has 4 divisors (see below), whose sum is σ = 100901664. Its totient is φ = 98923000.

The previous prime is 99912313. The next prime is 99912341. The reversal of 99912331 is 13321999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13321999 = 17 ⋅783647.

It is a cyclic number.

It is not a de Polignac number, because 99912331 - 2¹³ = 99904139 is a prime.

It is a super-2 number, since 2×99912331² = 19964947771707122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99912341) 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, 494515 + ... + 494716.

It is an arithmetic number, because the mean of its divisors is an integer number (25225416).

Almost surely, 2^99912331 is an apocalyptic number.

99912331 is a deficient number, since it is larger than the sum of its proper divisors (989333).

99912331 is a wasteful number, since it uses less digits than its factorization.

99912331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989332.

The product of its digits is 13122, while the sum is 37.

The square root of 99912331 is about 9995.6155888469. The cubic root of 99912331 is about 464.0232025531.

The spelling of 99912331 in words is "ninety-nine million, nine hundred twelve thousand, three hundred thirty-one".