18165313 has 2 divisors, whose sum is σ = 18165314. Its totient is φ = 18165312.

The previous prime is 18165271. The next prime is 18165319. The reversal of 18165313 is 31356181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18122049 + 43264 = 4257^2 + 208^2 .

It is an emirp because it is prime and its reverse (31356181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18165313 - 2⁹ = 18164801 is a prime.

It is not a weakly prime, because it can be changed into another prime (18165319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9082656 + 9082657.

It is an arithmetic number, because the mean of its divisors is an integer number (9082657).

Almost surely, 2^18165313 is an apocalyptic number.

It is an amenable number.

18165313 is a deficient number, since it is larger than the sum of its proper divisors (1).

18165313 is an equidigital number, since it uses as much as digits as its factorization.

18165313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 18165313 is about 4262.0784835571. The cubic root of 18165313 is about 262.8739969024.

The spelling of 18165313 in words is "eighteen million, one hundred sixty-five thousand, three hundred thirteen".