18313693 has 2 divisors, whose sum is σ = 18313694. Its totient is φ = 18313692.

The previous prime is 18313661. The next prime is 18313717. The reversal of 18313693 is 39631381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14730244 + 3583449 = 3838^2 + 1893^2 .

It is an emirp because it is prime and its reverse (39631381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18313693 - 2⁵ = 18313661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18310693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9156846 + 9156847.

It is an arithmetic number, because the mean of its divisors is an integer number (9156847).

Almost surely, 2^18313693 is an apocalyptic number.

It is an amenable number.

18313693 is a deficient number, since it is larger than the sum of its proper divisors (1).

18313693 is an equidigital number, since it uses as much as digits as its factorization.

18313693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 34.

The square root of 18313693 is about 4279.4500814941. The cubic root of 18313693 is about 263.5878027627.

The spelling of 18313693 in words is "eighteen million, three hundred thirteen thousand, six hundred ninety-three".