18314581 has 2 divisors, whose sum is σ = 18314582. Its totient is φ = 18314580.

The previous prime is 18314563. The next prime is 18314599. The reversal of 18314581 is 18541381.

It is a balanced prime because it is at equal distance from previous prime (18314563) and next prime (18314599).

It can be written as a sum of positive squares in only one way, i.e., 16532356 + 1782225 = 4066^2 + 1335^2 .

It is a cyclic number.

It is not a de Polignac number, because 18314581 - 2⁹ = 18314069 is a prime.

It is a super-2 number, since 2×18314581² = 670847754411122, which contains 22 as substring.

It is a zygodrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18314281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9157290 + 9157291.

It is an arithmetic number, because the mean of its divisors is an integer number (9157291).

Almost surely, 2^18314581 is an apocalyptic number.

It is an amenable number.

18314581 is a deficient number, since it is larger than the sum of its proper divisors (1).

18314581 is an equidigital number, since it uses as much as digits as its factorization.

18314581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 31.

The square root of 18314581 is about 4279.5538318848. The cubic root of 18314581 is about 263.5920630027.

The spelling of 18314581 in words is "eighteen million, three hundred fourteen thousand, five hundred eighty-one".