18117625 has 8 divisors (see below), whose sum is σ = 22610952. Its totient is φ = 14494000.

The previous prime is 18117611. The next prime is 18117647. The reversal of 18117625 is 52671181.

It can be written as a sum of positive squares in 4 ways, for example, as 3279721 + 14837904 = 1811^2 + 3852^2 .

It is not a de Polignac number, because 18117625 - 2⁷ = 18117497 is a prime.

It is a Duffinian number.

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, 72346 + ... + 72595.

It is an arithmetic number, because the mean of its divisors is an integer number (2826369).

Almost surely, 2^18117625 is an apocalyptic number.

It is an amenable number.

18117625 is a deficient number, since it is larger than the sum of its proper divisors (4493327).

18117625 is an equidigital number, since it uses as much as digits as its factorization.

18117625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144956 (or 144946 counting only the distinct ones).

The product of its digits is 3360, while the sum is 31.

The square root of 18117625 is about 4256.4803535315. The cubic root of 18117625 is about 262.6437610115.

The spelling of 18117625 in words is "eighteen million, one hundred seventeen thousand, six hundred twenty-five".