18168013 has 2 divisors, whose sum is σ = 18168014. Its totient is φ = 18168012.

The previous prime is 18167993. The next prime is 18168023. The reversal of 18168013 is 31086181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17280649 + 887364 = 4157^2 + 942^2 .

It is a cyclic number.

It is not a de Polignac number, because 18168013 - 2²¹ = 16070861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18168023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9084006 + 9084007.

It is an arithmetic number, because the mean of its divisors is an integer number (9084007).

Almost surely, 2^18168013 is an apocalyptic number.

It is an amenable number.

18168013 is a deficient number, since it is larger than the sum of its proper divisors (1).

18168013 is an equidigital number, since it uses as much as digits as its factorization.

18168013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 18168013 is about 4262.3952186535. The cubic root of 18168013 is about 262.8870203431.

The spelling of 18168013 in words is "eighteen million, one hundred sixty-eight thousand, thirteen".