231521000523513 has 64 divisors (see below), whose sum is σ = 334194648883200. Its totient is φ = 142123965984000.

The previous prime is 231521000523497. The next prime is 231521000523601. The reversal of 231521000523513 is 315325000125132.

It is not a de Polignac number, because 231521000523513 - 2⁴ = 231521000523497 is a prime.

It is a super-2 number, since 2×231521000523513² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231521000523613) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 210782523 + ... + 211878063.

It is an arithmetic number, because the mean of its divisors is an integer number (5221791388800).

Almost surely, 2^{231521000523513} is an apocalyptic number.

It is an amenable number.

231521000523513 is a deficient number, since it is larger than the sum of its proper divisors (102673648359687).

231521000523513 is a wasteful number, since it uses less digits than its factorization.

231521000523513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096374.

The product of its (nonzero) digits is 27000, while the sum is 33.

Adding to 231521000523513 its reverse (315325000125132), we get a palindrome (546846000648645).

The spelling of 231521000523513 in words is "two hundred thirty-one trillion, five hundred twenty-one billion, five hundred twenty-three thousand, five hundred thirteen".