31140332513 has 4 divisors (see below), whose sum is σ = 31261501380. Its totient is φ = 31019163648.

The previous prime is 31140332467. The next prime is 31140332537. The reversal of 31140332513 is 31523304113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14753260369 + 16387072144 = 121463^2 + 128012^2 .

It is a cyclic number.

It is not a de Polignac number, because 31140332513 - 2²⁰ = 31139283937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31140332413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60584048 + ... + 60584561.

It is an arithmetic number, because the mean of its divisors is an integer number (7815375345).

Almost surely, 2^31140332513 is an apocalyptic number.

It is an amenable number.

31140332513 is a deficient number, since it is larger than the sum of its proper divisors (121168867).

31140332513 is a wasteful number, since it uses less digits than its factorization.

31140332513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121168866.

The product of its (nonzero) digits is 3240, while the sum is 26.

Adding to 31140332513 its reverse (31523304113), we get a palindrome (62663636626).

The spelling of 31140332513 in words is "thirty-one billion, one hundred forty million, three hundred thirty-two thousand, five hundred thirteen".