231521452 has 12 divisors (see below), whose sum is σ = 407589840. Its totient is φ = 115067216.

The previous prime is 231521431. The next prime is 231521461. The reversal of 231521452 is 254125132.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172627 + ... + 173962.

It is an arithmetic number, because the mean of its divisors is an integer number (33965820).

Almost surely, 2^231521452 is an apocalyptic number.

It is an amenable number.

231521452 is a deficient number, since it is larger than the sum of its proper divisors (176068388).

231521452 is a wasteful number, since it uses less digits than its factorization.

231521452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346760 (or 346758 counting only the distinct ones).

The product of its digits is 2400, while the sum is 25.

The square root of 231521452 is about 15215.8289948330. The cubic root of 231521452 is about 614.0405883753.

Adding to 231521452 its reverse (254125132), we get a palindrome (485646584).

The spelling of 231521452 in words is "two hundred thirty-one million, five hundred twenty-one thousand, four hundred fifty-two".