111556231 has 2 divisors, whose sum is σ = 111556232. Its totient is φ = 111556230.

The previous prime is 111556219. The next prime is 111556241. The reversal of 111556231 is 132655111.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111556231 - 2⁷ = 111556103 is a prime.

It is a super-2 number, since 2×111556231² = 24889585349850722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111556196 and 111556205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111556241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55778115 + 55778116.

It is an arithmetic number, because the mean of its divisors is an integer number (55778116).

Almost surely, 2^111556231 is an apocalyptic number.

111556231 is a deficient number, since it is larger than the sum of its proper divisors (1).

111556231 is an equidigital number, since it uses as much as digits as its factorization.

111556231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 900, while the sum is 25.

The square root of 111556231 is about 10562.0183203780. The cubic root of 111556231 is about 481.3909753743.

The spelling of 111556231 in words is "one hundred eleven million, five hundred fifty-six thousand, two hundred thirty-one".