231556231 has 2 divisors, whose sum is σ = 231556232. Its totient is φ = 231556230.

The previous prime is 231556207. The next prime is 231556243. The reversal of 231556231 is 132655132.

231556231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231556231 - 2⁷ = 231556103 is a prime.

It is a super-2 number, since 2×231556231² = 107236576229850722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231556231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231556291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115778115 + 115778116.

It is an arithmetic number, because the mean of its divisors is an integer number (115778116).

Almost surely, 2^231556231 is an apocalyptic number.

231556231 is a deficient number, since it is larger than the sum of its proper divisors (1).

231556231 is an equidigital number, since it uses as much as digits as its factorization.

231556231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 28.

The square root of 231556231 is about 15216.9718078204. The cubic root of 231556231 is about 614.0713337600.

The spelling of 231556231 in words is "two hundred thirty-one million, five hundred fifty-six thousand, two hundred thirty-one".