18994361 has 2 divisors, whose sum is σ = 18994362. Its totient is φ = 18994360.

The previous prime is 18994337. The next prime is 18994373. The reversal of 18994361 is 16349981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11182336 + 7812025 = 3344^2 + 2795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18994361 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18994561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9497180 + 9497181.

It is an arithmetic number, because the mean of its divisors is an integer number (9497181).

Almost surely, 2^18994361 is an apocalyptic number.

It is an amenable number.

18994361 is a deficient number, since it is larger than the sum of its proper divisors (1).

18994361 is an equidigital number, since it uses as much as digits as its factorization.

18994361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 18994361 is about 4358.2520578782. The cubic root of 18994361 is about 266.8137638095.

The spelling of 18994361 in words is "eighteen million, nine hundred ninety-four thousand, three hundred sixty-one".