18632161 has 4 divisors (see below), whose sum is σ = 18670000. Its totient is φ = 18594324.

The previous prime is 18632149. The next prime is 18632167. The reversal of 18632161 is 16123681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18632161 - 2⁵ = 18632129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18632167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18171 + ... + 19168.

It is an arithmetic number, because the mean of its divisors is an integer number (4667500).

Almost surely, 2^18632161 is an apocalyptic number.

It is an amenable number.

18632161 is a deficient number, since it is larger than the sum of its proper divisors (37839).

18632161 is an equidigital number, since it uses as much as digits as its factorization.

18632161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37838.

The product of its digits is 1728, while the sum is 28.

The square root of 18632161 is about 4316.4986968607. The cubic root of 18632161 is about 265.1069273012.

The spelling of 18632161 in words is "eighteen million, six hundred thirty-two thousand, one hundred sixty-one".