231131131 has 32 divisors (see below), whose sum is σ = 301708800. Its totient is φ = 171790080.

The previous prime is 231131129. The next prime is 231131141. The reversal of 231131131 is 131131132.

It is not a de Polignac number, because 231131131 - 2¹ = 231131129 is a prime.

It is a super-2 number, since 2×231131131² = 106843199434678322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231131111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 198156 + ... + 199318.

It is an arithmetic number, because the mean of its divisors is an integer number (9428400).

Almost surely, 2^231131131 is an apocalyptic number.

231131131 is a deficient number, since it is larger than the sum of its proper divisors (70577669).

231131131 is a wasteful number, since it uses less digits than its factorization.

231131131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299.

The product of its digits is 54, while the sum is 16.

The square root of 231131131 is about 15202.9974347166. The cubic root of 231131131 is about 613.6953248319.

Adding to 231131131 its reverse (131131132), we get a palindrome (362262263).

Subtracting from 231131131 its reverse (131131132), we obtain a palindrome (99999999).

The spelling of 231131131 in words is "two hundred thirty-one million, one hundred thirty-one thousand, one hundred thirty-one".