231721272 has 48 divisors (see below), whose sum is σ = 636189840. Its totient is φ = 76180608.

The previous prime is 231721253. The next prime is 231721277. The reversal of 231721272 is 272127132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231721277) 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, 16788 + ... + 27299.

It is an arithmetic number, because the mean of its divisors is an integer number (13253955).

Almost surely, 2^231721272 is an apocalyptic number.

It is an amenable number.

231721272 is an abundant number, since it is smaller than the sum of its proper divisors (404468568).

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

231721272 is a wasteful number, since it uses less digits than its factorization.

231721272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44172 (or 44165 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 231721272 is about 15222.3937670788. The cubic root of 231721272 is about 614.2171916047.

The spelling of 231721272 in words is "two hundred thirty-one million, seven hundred twenty-one thousand, two hundred seventy-two".