31875343816 has 8 divisors (see below), whose sum is σ = 59766269670. Its totient is φ = 15937671904.

The previous prime is 31875343813. The next prime is 31875343817. The reversal of 31875343816 is 61834357813.

It can be written as a sum of positive squares in only one way, i.e., 30083514916 + 1791828900 = 173446^2 + 42330^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 31875343816.

It is not an unprimeable number, because it can be changed into a prime (31875343813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1992208981 + ... + 1992208996.

Almost surely, 2^31875343816 is an apocalyptic number.

It is an amenable number.

31875343816 is a deficient number, since it is larger than the sum of its proper divisors (27890925854).

31875343816 is a wasteful number, since it uses less digits than its factorization.

31875343816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3984417983 (or 3984417979 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 49.

The spelling of 31875343816 in words is "thirty-one billion, eight hundred seventy-five million, three hundred forty-three thousand, eight hundred sixteen".