31899388816 has 15 divisors (see below), whose sum is σ = 61806450043. Its totient is φ = 15949337200.

The previous prime is 31899388799. The next prime is 31899388841. The reversal of 31899388816 is 61888399813.

The square root of 31899388816 is 178604.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 692091 + ... + 736741.

Almost surely, 2^31899388816 is an apocalyptic number.

31899388816 is the 178604-th square number.

It is an amenable number.

31899388816 is a deficient number, since it is larger than the sum of its proper divisors (29907061227).

31899388816 is an frugal number, since it uses more digits than its factorization.

31899388816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89310 (or 44653 counting only the distinct ones).

The product of its digits is 17915904, while the sum is 64.

Multiplying 31899388816 by its sum of digits (64), we get a square (2041560884224 = 1428832²).

The spelling of 31899388816 in words is "thirty-one billion, eight hundred ninety-nine million, three hundred eighty-eight thousand, eight hundred sixteen".