3131082813 has 4 divisors (see below), whose sum is σ = 4174777088. Its totient is φ = 2087388540.

The previous prime is 3131082769. The next prime is 3131082821. The reversal of 3131082813 is 3182801313.

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 not a de Polignac number, because 3131082813 - 2²² = 3126888509 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 (3131082893) 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, 521847133 + ... + 521847138.

It is an arithmetic number, because the mean of its divisors is an integer number (1043694272).

Almost surely, 2^3131082813 is an apocalyptic number.

It is an amenable number.

3131082813 is a deficient number, since it is larger than the sum of its proper divisors (1043694275).

3131082813 is a wasteful number, since it uses less digits than its factorization.

3131082813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043694274.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 3131082813 is about 55956.0793211962. The cubic root of 3131082813 is about 1462.9568544536.

The spelling of 3131082813 in words is "three billion, one hundred thirty-one million, eighty-two thousand, eight hundred thirteen".