18445313 has 2 divisors, whose sum is σ = 18445314. Its totient is φ = 18445312.

The previous prime is 18445253. The next prime is 18445319. The reversal of 18445313 is 31354481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12837889 + 5607424 = 3583^2 + 2368^2 .

It is a cyclic number.

It is not a de Polignac number, because 18445313 - 2¹⁰ = 18444289 is a prime.

It is not a weakly prime, because it can be changed into another prime (18445319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9222656 + 9222657.

It is an arithmetic number, because the mean of its divisors is an integer number (9222657).

Almost surely, 2^18445313 is an apocalyptic number.

It is an amenable number.

18445313 is a deficient number, since it is larger than the sum of its proper divisors (1).

18445313 is an equidigital number, since it uses as much as digits as its factorization.

18445313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 29.

The square root of 18445313 is about 4294.8006938623. The cubic root of 18445313 is about 264.2177620561.

Adding to 18445313 its reverse (31354481), we get a palindrome (49799794).

The spelling of 18445313 in words is "eighteen million, four hundred forty-five thousand, three hundred thirteen".