18081365 has 8 divisors (see below), whose sum is σ = 21754680. Its totient is φ = 14427072.

The previous prime is 18081359. The next prime is 18081367. The reversal of 18081365 is 56318081.

It can be written as a sum of positive squares in 4 ways, for example, as 625681 + 17455684 = 791^2 + 4178^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18081365 - 2²² = 13887061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18081367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2570 + ... + 6539.

It is an arithmetic number, because the mean of its divisors is an integer number (2719335).

Almost surely, 2^18081365 is an apocalyptic number.

It is an amenable number.

18081365 is a deficient number, since it is larger than the sum of its proper divisors (3673315).

18081365 is an equidigital number, since it uses as much as digits as its factorization.

18081365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9511.

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

The square root of 18081365 is about 4252.2188325626. The cubic root of 18081365 is about 262.4684285537.

The spelling of 18081365 in words is "eighteen million, eighty-one thousand, three hundred sixty-five".