111315231 has 24 divisors (see below), whose sum is σ = 163734480. Its totient is φ = 72864000.

The previous prime is 111315221. The next prime is 111315299. The reversal of 111315231 is 132513111.

111315231 = T₂₈₅₈ + T₂₈₅₉ + ... + T₂₈₈₄.

111315231 is a `hidden beast` number, since 11 + 131 + 523 + 1 = 666.

It is not a de Polignac number, because 111315231 - 2⁵ = 111315199 is a prime.

It is a super-2 number, since 2×111315231² = 24782161305166722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111315221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 125911 + ... + 126791.

It is an arithmetic number, because the mean of its divisors is an integer number (6822270).

Almost surely, 2^111315231 is an apocalyptic number.

111315231 is a deficient number, since it is larger than the sum of its proper divisors (52419249).

111315231 is a wasteful number, since it uses less digits than its factorization.

111315231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127 (or 1124 counting only the distinct ones).

The product of its digits is 90, while the sum is 18.

The square root of 111315231 is about 10550.6033476764. The cubic root of 111315231 is about 481.0440685013.

Adding to 111315231 its reverse (132513111), we get a palindrome (243828342).

The spelling of 111315231 in words is "one hundred eleven million, three hundred fifteen thousand, two hundred thirty-one".