231312400443 has 12 divisors (see below), whose sum is σ = 338823798768. Its totient is φ = 152036319120.

The previous prime is 231312400433. The next prime is 231312400457. The reversal of 231312400443 is 344004213132.

It is not a de Polignac number, because 231312400443 - 2⁴ = 231312400427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231312400433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180994980 + ... + 180996257.

It is an arithmetic number, because the mean of its divisors is an integer number (28235316564).

Almost surely, 2^231312400443 is an apocalyptic number.

231312400443 is a deficient number, since it is larger than the sum of its proper divisors (107511398325).

231312400443 is a wasteful number, since it uses less digits than its factorization.

231312400443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361991314 (or 361991311 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 231312400443 its reverse (344004213132), we get a palindrome (575316613575).

The spelling of 231312400443 in words is "two hundred thirty-one billion, three hundred twelve million, four hundred thousand, four hundred forty-three".