18580081 has 8 divisors (see below), whose sum is σ = 21062720. Its totient is φ = 16247952.

The previous prime is 18580063. The next prime is 18580117. The reversal of 18580081 is 18008581.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18580081 - 2²¹ = 16482929 is a prime.

It is a super-2 number, since 2×18580081² = 690438819933122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18580781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37365 + ... + 37858.

It is an arithmetic number, because the mean of its divisors is an integer number (2632840).

Almost surely, 2^18580081 is an apocalyptic number.

It is an amenable number.

18580081 is a deficient number, since it is larger than the sum of its proper divisors (2482639).

18580081 is a wasteful number, since it uses less digits than its factorization.

18580081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75255.

The product of its (nonzero) digits is 2560, while the sum is 31.

The square root of 18580081 is about 4310.4618082057. The cubic root of 18580081 is about 264.8596907647.

The spelling of 18580081 in words is "eighteen million, five hundred eighty thousand, eighty-one".