2131665325 has 6 divisors (see below), whose sum is σ = 2643265034. Its totient is φ = 1705332240.

The previous prime is 2131665293. The next prime is 2131665331. The reversal of 2131665325 is 5235661312.

It can be written as a sum of positive squares in 3 ways, for example, as 19527561 + 2112137764 = 4419^2 + 45958^2 .

It is not a de Polignac number, because 2131665325 - 2⁵ = 2131665293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42633282 + ... + 42633331.

Almost surely, 2^2131665325 is an apocalyptic number.

2131665325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2131665325 is a deficient number, since it is larger than the sum of its proper divisors (511599709).

2131665325 is an equidigital number, since it uses as much as digits as its factorization.

2131665325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85266623 (or 85266618 counting only the distinct ones).

The product of its digits is 32400, while the sum is 34.

The square root of 2131665325 is about 46169.9612843676. The cubic root of 2131665325 is about 1286.9835827563.

The spelling of 2131665325 in words is "two billion, one hundred thirty-one million, six hundred sixty-five thousand, three hundred twenty-five".