18506951 has 2 divisors, whose sum is σ = 18506952. Its totient is φ = 18506950.

The previous prime is 18506947. The next prime is 18506953. The reversal of 18506951 is 15960581.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18506951 - 2² = 18506947 is a prime.

It is a Sophie Germain prime.

Together with 18506953, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18506953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9253475 + 9253476.

It is an arithmetic number, because the mean of its divisors is an integer number (9253476).

Almost surely, 2^18506951 is an apocalyptic number.

18506951 is the 2300-th centered heptagonal number.

18506951 is a deficient number, since it is larger than the sum of its proper divisors (1).

18506951 is an equidigital number, since it uses as much as digits as its factorization.

18506951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 18506951 is about 4301.9705949716. The cubic root of 18506951 is about 264.5117436476.

The spelling of 18506951 in words is "eighteen million, five hundred six thousand, nine hundred fifty-one".