18331081 has 8 divisors (see below), whose sum is σ = 18961920. Its totient is φ = 17710368.

The previous prime is 18331043. The next prime is 18331091. The reversal of 18331081 is 18013381.

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 18331081 - 2⁹ = 18330569 is a prime.

It is a super-2 number, since 2×18331081² = 672057061257122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18331031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1245 + ... + 6181.

It is an arithmetic number, because the mean of its divisors is an integer number (2370240).

Almost surely, 2^18331081 is an apocalyptic number.

It is an amenable number.

18331081 is a deficient number, since it is larger than the sum of its proper divisors (630839).

18331081 is an equidigital number, since it uses as much as digits as its factorization.

18331081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5063.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 18331081 is about 4281.4811689414. The cubic root of 18331081 is about 263.6711978293.

The spelling of 18331081 in words is "eighteen million, three hundred thirty-one thousand, eighty-one".