18580361 has 2 divisors, whose sum is σ = 18580362. Its totient is φ = 18580360.

The previous prime is 18580357. The next prime is 18580363. The reversal of 18580361 is 16308581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11526025 + 7054336 = 3395^2 + 2656^2 .

It is an emirp because it is prime and its reverse (16308581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18580361 - 2² = 18580357 is a prime.

Together with 18580363, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18580363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9290180 + 9290181.

It is an arithmetic number, because the mean of its divisors is an integer number (9290181).

Almost surely, 2^18580361 is an apocalyptic number.

It is an amenable number.

18580361 is a deficient number, since it is larger than the sum of its proper divisors (1).

18580361 is an equidigital number, since it uses as much as digits as its factorization.

18580361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 18580361 is about 4310.4942872019. The cubic root of 18580361 is about 264.8610212279.

The spelling of 18580361 in words is "eighteen million, five hundred eighty thousand, three hundred sixty-one".