31520541313 has 12 divisors (see below), whose sum is σ = 33515643132. Its totient is φ = 29638142720.

The previous prime is 31520541257. The next prime is 31520541341. The reversal of 31520541313 is 31314502513.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 971444224 + 30549097089 = 31168^2 + 174783^2 .

It is not a de Polignac number, because 31520541313 - 2⁹ = 31520540801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31520541373) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 255231 + ... + 358027.

It is an arithmetic number, because the mean of its divisors is an integer number (2792970261).

Almost surely, 2^31520541313 is an apocalyptic number.

It is an amenable number.

31520541313 is a deficient number, since it is larger than the sum of its proper divisors (1995101819).

31520541313 is a wasteful number, since it uses less digits than its factorization.

31520541313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103892 (or 103875 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The spelling of 31520541313 in words is "thirty-one billion, five hundred twenty million, five hundred forty-one thousand, three hundred thirteen".