231155402540 has 24 divisors (see below), whose sum is σ = 513980836992. Its totient is φ = 87023210240.

The previous prime is 231155402531. The next prime is 231155402563. The reversal of 231155402540 is 45204551132.

231155402540 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 231155402497 and 231155402506.

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, 339934076 + ... + 339934755.

It is an arithmetic number, because the mean of its divisors is an integer number (21415868208).

Almost surely, 2^231155402540 is an apocalyptic number.

231155402540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231155402540 is an abundant number, since it is smaller than the sum of its proper divisors (282825434452).

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

231155402540 is a wasteful number, since it uses less digits than its factorization.

231155402540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679868857 (or 679868855 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 231155402540 its reverse (45204551132), we get a palindrome (276359953672).

The spelling of 231155402540 in words is "two hundred thirty-one billion, one hundred fifty-five million, four hundred two thousand, five hundred forty".