15813031252 has 6 divisors (see below), whose sum is σ = 27672804698. Its totient is φ = 7906515624.

The previous prime is 15813031237. The next prime is 15813031309. The reversal of 15813031252 is 25213031851.

It can be written as a sum of positive squares in only one way, i.e., 8048601796 + 7764429456 = 89714^2 + 88116^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1976628903 + ... + 1976628910.

Almost surely, 2^15813031252 is an apocalyptic number.

It is an amenable number.

15813031252 is a deficient number, since it is larger than the sum of its proper divisors (11859773446).

15813031252 is a wasteful number, since it uses less digits than its factorization.

15813031252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3953257817 (or 3953257815 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 15813031252 in words is "fifteen billion, eight hundred thirteen million, thirty-one thousand, two hundred fifty-two".