231721275 has 24 divisors (see below), whose sum is σ = 383656000. Its totient is φ = 123409440.

The previous prime is 231721253. The next prime is 231721277. The reversal of 231721275 is 572127132.

It is a de Polignac number, because none of the positive numbers 2^k-231721275 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 64476 + ... + 67974.

Almost surely, 2^231721275 is an apocalyptic number.

231721275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

231721275 is a deficient number, since it is larger than the sum of its proper divisors (151934725).

231721275 is a wasteful number, since it uses less digits than its factorization.

231721275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4395 (or 4390 counting only the distinct ones).

The product of its digits is 5880, while the sum is 30.

The square root of 231721275 is about 15222.3938656179. The cubic root of 231721275 is about 614.2171942553.

The spelling of 231721275 in words is "two hundred thirty-one million, seven hundred twenty-one thousand, two hundred seventy-five".