231571252 has 18 divisors (see below), whose sum is σ = 445440674. Its totient is φ = 105259440.

The previous prime is 231571231. The next prime is 231571261. The reversal of 231571252 is 252175132.

It can be written as a sum of positive squares in only one way, i.e., 222487056 + 9084196 = 14916^2 + 3014^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 231571252.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 238743 + ... + 239710.

Almost surely, 2^231571252 is an apocalyptic number.

231571252 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

231571252 is a deficient number, since it is larger than the sum of its proper divisors (213869422).

231571252 is a wasteful number, since it uses less digits than its factorization.

231571252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478479 (or 478466 counting only the distinct ones).

The product of its digits is 4200, while the sum is 28.

The square root of 231571252 is about 15217.4653605651. The cubic root of 231571252 is about 614.0846116955.

The spelling of 231571252 in words is "two hundred thirty-one million, five hundred seventy-one thousand, two hundred fifty-two".