18422491 has 2 divisors, whose sum is σ = 18422492. Its totient is φ = 18422490.

The previous prime is 18422483. The next prime is 18422497. The reversal of 18422491 is 19422481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18422491 - 2³ = 18422483 is a prime.

It is not a weakly prime, because it can be changed into another prime (18422497) 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, 9211245 + 9211246.

It is an arithmetic number, because the mean of its divisors is an integer number (9211246).

Almost surely, 2^18422491 is an apocalyptic number.

18422491 is a deficient number, since it is larger than the sum of its proper divisors (1).

18422491 is an equidigital number, since it uses as much as digits as its factorization.

18422491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 31.

The square root of 18422491 is about 4292.1429379740. The cubic root of 18422491 is about 264.1087467126.

The spelling of 18422491 in words is "eighteen million, four hundred twenty-two thousand, four hundred ninety-one".