2131186720 has 48 divisors (see below), whose sum is σ = 5422236120. Its totient is φ = 786898944.

The previous prime is 2131186711. The next prime is 2131186789. The reversal of 2131186720 is 276811312.

It can be written as a sum of positive squares in 4 ways, for example, as 1571012496 + 560174224 = 39636^2 + 23668^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 510225 + ... + 514384.

Almost surely, 2^2131186720 is an apocalyptic number.

2131186720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131186720 is an abundant number, since it is smaller than the sum of its proper divisors (3291049400).

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

2131186720 is a wasteful number, since it uses less digits than its factorization.

2131186720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024637 (or 1024629 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 2131186720 is about 46164.7779156361. Note that the first 3 decimals coincide. The cubic root of 2131186720 is about 1286.8872569909.

The spelling of 2131186720 in words is "two billion, one hundred thirty-one million, one hundred eighty-six thousand, seven hundred twenty".