18481369 has 2 divisors, whose sum is σ = 18481370. Its totient is φ = 18481368.

The previous prime is 18481321. The next prime is 18481391. The reversal of 18481369 is 96318481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11256025 + 7225344 = 3355^2 + 2688^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18481369 is a prime.

It is a super-2 number, since 2×18481369² = 683122000228322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18481069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9240684 + 9240685.

It is an arithmetic number, because the mean of its divisors is an integer number (9240685).

Almost surely, 2^18481369 is an apocalyptic number.

It is an amenable number.

18481369 is a deficient number, since it is larger than the sum of its proper divisors (1).

18481369 is an equidigital number, since it uses as much as digits as its factorization.

18481369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 40.

The square root of 18481369 is about 4298.9962782026. The cubic root of 18481369 is about 264.3898100078.

The spelling of 18481369 in words is "eighteen million, four hundred eighty-one thousand, three hundred sixty-nine".