18697697 has 2 divisors, whose sum is σ = 18697698. Its totient is φ = 18697696.

The previous prime is 18697673. The next prime is 18697703. The reversal of 18697697 is 79679681.

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., 12327121 + 6370576 = 3511^2 + 2524^2 .

It is an emirp because it is prime and its reverse (79679681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18697697 - 2⁶ = 18697633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18697607) 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, 9348848 + 9348849.

It is an arithmetic number, because the mean of its divisors is an integer number (9348849).

Almost surely, 2^18697697 is an apocalyptic number.

It is an amenable number.

18697697 is a deficient number, since it is larger than the sum of its proper divisors (1).

18697697 is an equidigital number, since it uses as much as digits as its factorization.

18697697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 53.

The square root of 18697697 is about 4324.0833710742. The cubic root of 18697697 is about 265.4173889996.

The spelling of 18697697 in words is "eighteen million, six hundred ninety-seven thousand, six hundred ninety-seven".