3131313157 has 4 divisors (see below), whose sum is σ = 3578643616. Its totient is φ = 2683982700.

The previous prime is 3131313121. The next prime is 3131313169. The reversal of 3131313157 is 7513131313.

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 de Polignac number, because none of the positive numbers 2^k-3131313157 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 (3131313557) 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, 223665219 + ... + 223665232.

It is an arithmetic number, because the mean of its divisors is an integer number (894660904).

Almost surely, 2^3131313157 is an apocalyptic number.

It is an amenable number.

3131313157 is a deficient number, since it is larger than the sum of its proper divisors (447330459).

3131313157 is an equidigital number, since it uses as much as digits as its factorization.

3131313157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447330458.

The product of its digits is 2835, while the sum is 28.

The square root of 3131313157 is about 55958.1375404865. The cubic root of 3131313157 is about 1462.9927286320.

The spelling of 3131313157 in words is "three billion, one hundred thirty-one million, three hundred thirteen thousand, one hundred fifty-seven".