18671291 has 2 divisors, whose sum is σ = 18671292. Its totient is φ = 18671290.

The previous prime is 18671251. The next prime is 18671293. The reversal of 18671291 is 19217681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18671291 - 2⁶ = 18671227 is a prime.

Together with 18671293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18671293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9335645 + 9335646.

It is an arithmetic number, because the mean of its divisors is an integer number (9335646).

Almost surely, 2^18671291 is an apocalyptic number.

18671291 is a deficient number, since it is larger than the sum of its proper divisors (1).

18671291 is an equidigital number, since it uses as much as digits as its factorization.

18671291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 35.

The square root of 18671291 is about 4321.0289283919. The cubic root of 18671291 is about 265.2923840593.

The spelling of 18671291 in words is "eighteen million, six hundred seventy-one thousand, two hundred ninety-one".