18679291 has 2 divisors, whose sum is σ = 18679292. Its totient is φ = 18679290.

The previous prime is 18679273. The next prime is 18679303. The reversal of 18679291 is 19297681.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18679291 is a prime.

It is not a weakly prime, because it can be changed into another prime (18679201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9339645 + 9339646.

It is an arithmetic number, because the mean of its divisors is an integer number (9339646).

Almost surely, 2^18679291 is an apocalyptic number.

18679291 is a deficient number, since it is larger than the sum of its proper divisors (1).

18679291 is an equidigital number, since it uses as much as digits as its factorization.

18679291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 43.

The square root of 18679291 is about 4321.9545346984. The cubic root of 18679291 is about 265.3302681747.

The spelling of 18679291 in words is "eighteen million, six hundred seventy-nine thousand, two hundred ninety-one".