231532420113513 has 10 divisors (see below), whose sum is σ = 345869417700554. Its totient is φ = 154354946742288.

The previous prime is 231532420113499. The next prime is 231532420113541. The reversal of 231532420113513 is 315311024235132.

231532420113513 is a `hidden beast` number, since 2 + 3 + 1 + 5 + 3 + 2 + 4 + 20 + 113 + 513 = 666.

It can be written as a sum of positive squares in only one way, i.e., 134456269598784 + 97076150514729 = 11595528^2 + 9852723^2 .

It is not a de Polignac number, because 231532420113513 - 2⁸ = 231532420113257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231532420113583) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1429212469756 + ... + 1429212469917.

Almost surely, 2^{231532420113513} is an apocalyptic number.

It is an amenable number.

231532420113513 is a deficient number, since it is larger than the sum of its proper divisors (114336997587041).

231532420113513 is an equidigital number, since it uses as much as digits as its factorization.

231532420113513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2858424939685 (or 2858424939676 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

Adding to 231532420113513 its reverse (315311024235132), we get a palindrome (546843444348645).

The spelling of 231532420113513 in words is "two hundred thirty-one trillion, five hundred thirty-two billion, four hundred twenty million, one hundred thirteen thousand, five hundred thirteen".