1657131912 has 32 divisors (see below), whose sum is σ = 4603144800. Its totient is φ = 552377232.

The previous prime is 1657131907. The next prime is 1657131919. The reversal of 1657131912 is 2191317561.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (1657131919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3835738 + ... + 3836169.

It is an arithmetic number, because the mean of its divisors is an integer number (143848275).

Almost surely, 2^1657131912 is an apocalyptic number.

1657131912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1657131912 is an abundant number, since it is smaller than the sum of its proper divisors (2946012888).

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

1657131912 is a wasteful number, since it uses less digits than its factorization.

1657131912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7671922 (or 7671912 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 1657131912 is about 40707.8851329813. The cubic root of 1657131912 is about 1183.3658359033.

The spelling of 1657131912 in words is "one billion, six hundred fifty-seven million, one hundred thirty-one thousand, nine hundred twelve".