18454451 has 2 divisors, whose sum is σ = 18454452. Its totient is φ = 18454450.

The previous prime is 18454427. The next prime is 18454477. The reversal of 18454451 is 15445481.

It is a weak prime.

It is an emirp because it is prime and its reverse (15445481) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18454451 is a prime.

It is a super-2 number, since 2×18454451² = 681133523422802, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18454481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9227225 + 9227226.

It is an arithmetic number, because the mean of its divisors is an integer number (9227226).

Almost surely, 2^18454451 is an apocalyptic number.

18454451 is a deficient number, since it is larger than the sum of its proper divisors (1).

18454451 is an equidigital number, since it uses as much as digits as its factorization.

18454451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12800, while the sum is 32.

The square root of 18454451 is about 4295.8644066125. The cubic root of 18454451 is about 264.2613869291.

The spelling of 18454451 in words is "eighteen million, four hundred fifty-four thousand, four hundred fifty-one".