3131913613 has 4 divisors (see below), whose sum is σ = 3132125280. Its totient is φ = 3131701948.

The previous prime is 3131913563. The next prime is 3131913709. The reversal of 3131913613 is 3163191313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3131913613 - 2⁹ = 3131913101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131913413) 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, 81823 + ... + 113836.

It is an arithmetic number, because the mean of its divisors is an integer number (783031320).

Almost surely, 2^3131913613 is an apocalyptic number.

It is an amenable number.

3131913613 is a deficient number, since it is larger than the sum of its proper divisors (211667).

3131913613 is a wasteful number, since it uses less digits than its factorization.

3131913613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211666.

The product of its digits is 4374, while the sum is 31.

The square root of 3131913613 is about 55963.5025083313. The cubic root of 3131913613 is about 1463.0862364324.

The spelling of 3131913613 in words is "three billion, one hundred thirty-one million, nine hundred thirteen thousand, six hundred thirteen".