18315673 has 2 divisors, whose sum is σ = 18315674. Its totient is φ = 18315672.

The previous prime is 18315653. The next prime is 18315691. The reversal of 18315673 is 37651381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16581184 + 1734489 = 4072^2 + 1317^2 .

It is a cyclic number.

It is not a de Polignac number, because 18315673 - 2⁵ = 18315641 is a prime.

It is a plaindrome in base 16.

It is a zygodrome in base 16.

It is not a weakly prime, because it can be changed into another prime (18315653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9157836 + 9157837.

It is an arithmetic number, because the mean of its divisors is an integer number (9157837).

Almost surely, 2^18315673 is an apocalyptic number.

It is an amenable number.

18315673 is a deficient number, since it is larger than the sum of its proper divisors (1).

18315673 is an equidigital number, since it uses as much as digits as its factorization.

18315673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 18315673 is about 4279.6814133765. The cubic root of 18315673 is about 263.5973017578.

The spelling of 18315673 in words is "eighteen million, three hundred fifteen thousand, six hundred seventy-three".