18108641 has 2 divisors, whose sum is σ = 18108642. Its totient is φ = 18108640.

The previous prime is 18108581. The next prime is 18108647. The reversal of 18108641 is 14680181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13719616 + 4389025 = 3704^2 + 2095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18108641 is a prime.

It is not a weakly prime, because it can be changed into another prime (18108647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9054320 + 9054321.

It is an arithmetic number, because the mean of its divisors is an integer number (9054321).

Almost surely, 2^18108641 is an apocalyptic number.

It is an amenable number.

18108641 is a deficient number, since it is larger than the sum of its proper divisors (1).

18108641 is an equidigital number, since it uses as much as digits as its factorization.

18108641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 18108641 is about 4255.4248906543. The cubic root of 18108641 is about 262.6003413823.

The spelling of 18108641 in words is "eighteen million, one hundred eight thousand, six hundred forty-one".