18512227 has 2 divisors, whose sum is σ = 18512228. Its totient is φ = 18512226.

The previous prime is 18512203. The next prime is 18512243. The reversal of 18512227 is 72221581.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18512227 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18512195 and 18512204.

It is not a weakly prime, because it can be changed into another prime (18512297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9256113 + 9256114.

It is an arithmetic number, because the mean of its divisors is an integer number (9256114).

Almost surely, 2^18512227 is an apocalyptic number.

18512227 is a deficient number, since it is larger than the sum of its proper divisors (1).

18512227 is an equidigital number, since it uses as much as digits as its factorization.

18512227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 28.

The square root of 18512227 is about 4302.5837586269. The cubic root of 18512227 is about 264.5368771117.

The spelling of 18512227 in words is "eighteen million, five hundred twelve thousand, two hundred twenty-seven".