231031129 has 6 divisors (see below), whose sum is σ = 268750554. Its totient is φ = 198026640.

The previous prime is 231031123. The next prime is 231031133. The reversal of 231031129 is 921130132.

It can be written as a sum of positive squares in only one way, i.e., 135675904 + 95355225 = 11648^2 + 9765^2 .

It is not a de Polignac number, because 231031129 - 2³ = 231031121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231031121) 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 5 ways as a sum of consecutive naturals, for example, 2357412 + ... + 2357509.

It is an arithmetic number, because the mean of its divisors is an integer number (44791759).

Almost surely, 2^231031129 is an apocalyptic number.

It is an amenable number.

231031129 is a deficient number, since it is larger than the sum of its proper divisors (37719425).

231031129 is an equidigital number, since it uses as much as digits as its factorization.

231031129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4714935 (or 4714928 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 231031129 is about 15199.7081879883. The cubic root of 231031129 is about 613.6068042121.

The spelling of 231031129 in words is "two hundred thirty-one million, thirty-one thousand, one hundred twenty-nine".