3131961660 has 48 divisors (see below), whose sum is σ = 9743882400. Its totient is φ = 835189632.

The previous prime is 3131961649. The next prime is 3131961661. The reversal of 3131961660 is 661691313.

3131961660 is a `hidden beast` number, since 3 + 1 + 31 + 9 + 616 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131961661) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 2899425 + ... + 2900504.

It is an arithmetic number, because the mean of its divisors is an integer number (202997550).

Almost surely, 2^3131961660 is an apocalyptic number.

3131961660 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3131961660 is an abundant number, since it is smaller than the sum of its proper divisors (6611920740).

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

3131961660 is a wasteful number, since it uses less digits than its factorization.

3131961660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5799947 (or 5799939 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 3131961660 is about 55963.9317775297. The cubic root of 3131961660 is about 1463.0937181782.

The spelling of 3131961660 in words is "three billion, one hundred thirty-one million, nine hundred sixty-one thousand, six hundred sixty".