18317081 has 4 divisors (see below), whose sum is σ = 18627600. Its totient is φ = 18006564.

The previous prime is 18317071. The next prime is 18317099. The reversal of 18317081 is 18071381.

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 not a de Polignac number, because 18317081 - 2¹⁴ = 18300697 is a prime.

It is a super-2 number, since 2×18317081² = 671030912721122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18317071) 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, 155171 + ... + 155288.

It is an arithmetic number, because the mean of its divisors is an integer number (4656900).

Almost surely, 2^18317081 is an apocalyptic number.

It is an amenable number.

18317081 is a deficient number, since it is larger than the sum of its proper divisors (310519).

18317081 is an equidigital number, since it uses as much as digits as its factorization.

18317081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310518.

The product of its (nonzero) digits is 1344, while the sum is 29.

The square root of 18317081 is about 4279.8459084411. The cubic root of 18317081 is about 263.6040561823.

The spelling of 18317081 in words is "eighteen million, three hundred seventeen thousand, eighty-one".