2172587865 has 32 divisors (see below), whose sum is σ = 3979269120. Its totient is φ = 991548864.

The previous prime is 2172587789. The next prime is 2172587899. The reversal of 2172587865 is 5687852712.

It is not a de Polignac number, because 2172587865 - 2⁸ = 2172587609 is a prime.

It is a super-2 number, since 2×2172587865² = 9440276062290516450, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48282 + ... + 81708.

It is an arithmetic number, because the mean of its divisors is an integer number (124352160).

Almost surely, 2^2172587865 is an apocalyptic number.

It is an amenable number.

2172587865 is a deficient number, since it is larger than the sum of its proper divisors (1806681255).

2172587865 is a wasteful number, since it uses less digits than its factorization.

2172587865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34061.

The product of its digits is 1881600, while the sum is 51.

The square root of 2172587865 is about 46611.0272896876. The cubic root of 2172587865 is about 1295.1670381771.

The spelling of 2172587865 in words is "two billion, one hundred seventy-two million, five hundred eighty-seven thousand, eight hundred sixty-five".