18418951 has 2 divisors, whose sum is σ = 18418952. Its totient is φ = 18418950.

The previous prime is 18418943. The next prime is 18418957. The reversal of 18418951 is 15981481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18418951 - 2³ = 18418943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18418951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18418957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9209475 + 9209476.

It is an arithmetic number, because the mean of its divisors is an integer number (9209476).

Almost surely, 2^18418951 is an apocalyptic number.

18418951 is a deficient number, since it is larger than the sum of its proper divisors (1).

18418951 is an equidigital number, since it uses as much as digits as its factorization.

18418951 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 18418951 is about 4291.7305367416. The cubic root of 18418951 is about 264.0918288981.

The spelling of 18418951 in words is "eighteen million, four hundred eighteen thousand, nine hundred fifty-one".