18454081 has 4 divisors (see below), whose sum is σ = 18549892. Its totient is φ = 18358272.

The previous prime is 18454069. The next prime is 18454087. The reversal of 18454081 is 18045481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18045481 = 2473 ⋅7297.

It can be written as a sum of positive squares in 2 ways, for example, as 4165681 + 14288400 = 2041^2 + 3780^2 .

It is a cyclic number.

It is not a de Polignac number, because 18454081 - 2⁵ = 18454049 is a prime.

It is a super-2 number, since 2×18454081² = 681106211109122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18454087) 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, 47616 + ... + 48001.

It is an arithmetic number, because the mean of its divisors is an integer number (4637473).

Almost surely, 2^18454081 is an apocalyptic number.

It is an amenable number.

18454081 is a deficient number, since it is larger than the sum of its proper divisors (95811).

18454081 is an equidigital number, since it uses as much as digits as its factorization.

18454081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95810.

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 18454081 is about 4295.8213417227. The cubic root of 18454081 is about 264.2596208264.

The spelling of 18454081 in words is "eighteen million, four hundred fifty-four thousand, eighty-one".