231131000 has 32 divisors (see below), whose sum is σ = 540848880. Its totient is φ = 92452000.

The previous prime is 231130973. The next prime is 231131041. The reversal of 231131000 is 131132.

It is a super-2 number, since 2×231131000² = 106843078322000000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114566 + ... + 116565.

Almost surely, 2^231131000 is an apocalyptic number.

231131000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231131000 is an abundant number, since it is smaller than the sum of its proper divisors (309717880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231131000 is a wasteful number, since it uses less digits than its factorization.

231131000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231152 (or 231138 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 231131000 is about 15202.9931263551. The cubic root of 231131000 is about 613.6952088890.

Adding to 231131000 its reverse (131132), we get a palindrome (231262132).

The spelling of 231131000 in words is "two hundred thirty-one million, one hundred thirty-one thousand".