18461291 has 2 divisors, whose sum is σ = 18461292. Its totient is φ = 18461290.

The previous prime is 18461279. The next prime is 18461297. The reversal of 18461291 is 19216481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18461291 - 2⁶ = 18461227 is a prime.

It is not a weakly prime, because it can be changed into another prime (18461297) 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, 9230645 + 9230646.

It is an arithmetic number, because the mean of its divisors is an integer number (9230646).

Almost surely, 2^18461291 is an apocalyptic number.

18461291 is a deficient number, since it is larger than the sum of its proper divisors (1).

18461291 is an equidigital number, since it uses as much as digits as its factorization.

18461291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 32.

The square root of 18461291 is about 4296.6604473707. The cubic root of 18461291 is about 264.2940317115.

The spelling of 18461291 in words is "eighteen million, four hundred sixty-one thousand, two hundred ninety-one".