231532521 has 32 divisors (see below), whose sum is σ = 351682560. Its totient is φ = 134217600.

The previous prime is 231532517. The next prime is 231532531. The reversal of 231532521 is 125235132.

It is a happy number.

It is not a de Polignac number, because 231532521 - 2² = 231532517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231532491 and 231532500.

It is not an unprimeable number, because it can be changed into a prime (231532531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89776 + ... + 92318.

It is an arithmetic number, because the mean of its divisors is an integer number (10990080).

Almost surely, 2^231532521 is an apocalyptic number.

It is an amenable number.

231532521 is a deficient number, since it is larger than the sum of its proper divisors (120150039).

231532521 is a wasteful number, since it uses less digits than its factorization.

231532521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2677.

The product of its digits is 1800, while the sum is 24.

The square root of 231532521 is about 15216.1927235429. The cubic root of 231532521 is about 614.0503739436.

Adding to 231532521 its reverse (125235132), we get a palindrome (356767653).

The spelling of 231532521 in words is "two hundred thirty-one million, five hundred thirty-two thousand, five hundred twenty-one".