18514891 has 2 divisors, whose sum is σ = 18514892. Its totient is φ = 18514890.

The previous prime is 18514841. The next prime is 18514913. The reversal of 18514891 is 19841581.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18514891 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18514891.

It is not a weakly prime, because it can be changed into another prime (18514831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9257445 + 9257446.

It is an arithmetic number, because the mean of its divisors is an integer number (9257446).

Almost surely, 2^18514891 is an apocalyptic number.

18514891 is a deficient number, since it is larger than the sum of its proper divisors (1).

18514891 is an equidigital number, since it uses as much as digits as its factorization.

18514891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 37.

The square root of 18514891 is about 4302.8933289125. The cubic root of 18514891 is about 264.5495658865.

The spelling of 18514891 in words is "eighteen million, five hundred fourteen thousand, eight hundred ninety-one".