231552131 has 4 divisors (see below), whose sum is σ = 234724152. Its totient is φ = 228380112.

The previous prime is 231552091. The next prime is 231552161. The reversal of 231552131 is 131255132.

It is a happy number.

231552131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231552131 - 2²⁶ = 164443267 is a prime.

It is a super-2 number, since 2×231552131² = 107232778741282322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231552097 and 231552106.

It is not an unprimeable number, because it can be changed into a prime (231552161) 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, 1585901 + ... + 1586046.

It is an arithmetic number, because the mean of its divisors is an integer number (58681038).

Almost surely, 2^231552131 is an apocalyptic number.

231552131 is a deficient number, since it is larger than the sum of its proper divisors (3172021).

231552131 is an equidigital number, since it uses as much as digits as its factorization.

231552131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3172020.

The product of its digits is 900, while the sum is 23.

The square root of 231552131 is about 15216.8370892246. The cubic root of 231552131 is about 614.0677094319.

The spelling of 231552131 in words is "two hundred thirty-one million, five hundred fifty-two thousand, one hundred thirty-one".