3131321013 has 6 divisors (see below), whose sum is σ = 4523019254. Its totient is φ = 2087547336.

The previous prime is 3131321009. The next prime is 3131321021. The reversal of 3131321013 is 3101231313.

It is a happy number.

3131321013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2701712484 + 429608529 = 51978^2 + 20727^2 .

It is not a de Polignac number, because 3131321013 - 2² = 3131321009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131321033) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 173962270 + ... + 173962287.

Almost surely, 2^3131321013 is an apocalyptic number.

It is an amenable number.

3131321013 is a deficient number, since it is larger than the sum of its proper divisors (1391698241).

3131321013 is a wasteful number, since it uses less digits than its factorization.

3131321013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347924563 (or 347924560 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 3131321013 is about 55958.2077357737. The cubic root of 3131321013 is about 1462.9939521082.

Adding to 3131321013 its reverse (3101231313), we get a palindrome (6232552326).

It can be divided in two parts, 31313 and 21013, that added together give a triangular number (52326 = T₃₂₃).

The spelling of 3131321013 in words is "three billion, one hundred thirty-one million, three hundred twenty-one thousand, thirteen".