3131321012 has 6 divisors (see below), whose sum is σ = 5479811778. Its totient is φ = 1565660504.

The previous prime is 3131321009. The next prime is 3131321021. The reversal of 3131321012 is 2101231313.

It can be written as a sum of positive squares in only one way, i.e., 2967634576 + 163686436 = 54476^2 + 12794^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 391415123 + ... + 391415130.

It is an arithmetic number, because the mean of its divisors is an integer number (913301963).

Almost surely, 2^3131321012 is an apocalyptic number.

It is an amenable number.

3131321012 is a deficient number, since it is larger than the sum of its proper divisors (2348490766).

3131321012 is a wasteful number, since it uses less digits than its factorization.

3131321012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782830257 (or 782830255 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 3131321012 is about 55958.2077268384. The cubic root of 3131321012 is about 1462.9939519524.

Adding to 3131321012 its reverse (2101231313), we get a palindrome (5232552325).

It can be divided in two parts, 31313 and 21012, that added together give a palindrome (52325).

The spelling of 3131321012 in words is "three billion, one hundred thirty-one million, three hundred twenty-one thousand, twelve".