18696917 has 2 divisors, whose sum is σ = 18696918. Its totient is φ = 18696916.

The previous prime is 18696913. The next prime is 18696919. The reversal of 18696917 is 71969681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17422276 + 1274641 = 4174^2 + 1129^2 .

It is a cyclic number.

It is not a de Polignac number, because 18696917 - 2² = 18696913 is a prime.

Together with 18696919, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18696913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9348458 + 9348459.

It is an arithmetic number, because the mean of its divisors is an integer number (9348459).

Almost surely, 2^18696917 is an apocalyptic number.

It is an amenable number.

18696917 is a deficient number, since it is larger than the sum of its proper divisors (1).

18696917 is an equidigital number, since it uses as much as digits as its factorization.

18696917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 47.

The square root of 18696917 is about 4323.9931776079. The cubic root of 18696917 is about 265.4136981985.

The spelling of 18696917 in words is "eighteen million, six hundred ninety-six thousand, nine hundred seventeen".