231131102323240 has 128 divisors (see below), whose sum is σ = 628673453084160. Its totient is φ = 74761167089664.

The previous prime is 231131102323213. The next prime is 231131102323271. The reversal of 231131102323240 is 42323201131132.

It is a super-2 number, since 2×231131102323240² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 231131102323199 and 231131102323208.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 245351269 + ... + 246291508.

It is an arithmetic number, because the mean of its divisors is an integer number (4911511352220).

Almost surely, 2^{231131102323240} is an apocalyptic number.

231131102323240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231131102323240 is an abundant number, since it is smaller than the sum of its proper divisors (397542350760920).

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

231131102323240 is a wasteful number, since it uses less digits than its factorization.

231131102323240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491642891 (or 491642887 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 231131102323240 its reverse (42323201131132), we get a palindrome (273454303454372).

The spelling of 231131102323240 in words is "two hundred thirty-one trillion, one hundred thirty-one billion, one hundred two million, three hundred twenty-three thousand, two hundred forty".