3131813988 has 18 divisors (see below), whose sum is σ = 7916529894. Its totient is φ = 1043937984.

The previous prime is 3131813963. The next prime is 3131813989. The reversal of 3131813988 is 8893181313.

3131813988 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., 2642165604 + 489648384 = 51402^2 + 22128^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (3131813989) 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, 43497381 + ... + 43497452.

Almost surely, 2^3131813988 is an apocalyptic number.

It is an amenable number.

3131813988 is an abundant number, since it is smaller than the sum of its proper divisors (4784715906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3131813988 is a wasteful number, since it uses less digits than its factorization.

3131813988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86994843 (or 86994838 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 3131813988 is about 55962.6124122168. The cubic root of 3131813988 is about 1463.0707228593.

The spelling of 3131813988 in words is "three billion, one hundred thirty-one million, eight hundred thirteen thousand, nine hundred eighty-eight".