31513113 has 12 divisors (see below), whose sum is σ = 45632548. Its totient is φ = 20956320.

The previous prime is 31513091. The next prime is 31513117. The reversal of 31513113 is 31131513.

It can be written as a sum of positive squares in 2 ways, for example, as 14768649 + 16744464 = 3843^2 + 4092^2 .

It is not a de Polignac number, because 31513113 - 2⁶ = 31513049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31513117) 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, 370 + ... + 7947.

Almost surely, 2^31513113 is an apocalyptic number.

It is an amenable number.

31513113 is a deficient number, since it is larger than the sum of its proper divisors (14119435).

31513113 is a wasteful number, since it uses less digits than its factorization.

31513113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8744 (or 8741 counting only the distinct ones).

The product of its digits is 135, while the sum is 18.

The square root of 31513113 is about 5613.6541574985. The cubic root of 31513113 is about 315.8617973076.

Adding to 31513113 its reverse (31131513), we get a palindrome (62644626).

It can be divided in two parts, 31513 and 113, that added together give a triangular number (31626 = T₂₅₁).

The spelling of 31513113 in words is "thirty-one million, five hundred thirteen thousand, one hundred thirteen".