18916697 has 2 divisors, whose sum is σ = 18916698. Its totient is φ = 18916696.

The previous prime is 18916693. The next prime is 18916717. The reversal of 18916697 is 79661981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17884441 + 1032256 = 4229^2 + 1016^2 .

It is a cyclic number.

It is not a de Polignac number, because 18916697 - 2² = 18916693 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18916691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9458348 + 9458349.

It is an arithmetic number, because the mean of its divisors is an integer number (9458349).

Almost surely, 2^18916697 is an apocalyptic number.

It is an amenable number.

18916697 is a deficient number, since it is larger than the sum of its proper divisors (1).

18916697 is an equidigital number, since it uses as much as digits as its factorization.

18916697 is an evil number, because the sum of its binary digits is even.

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

The square root of 18916697 is about 4349.3329373595. The cubic root of 18916697 is about 266.4496183508.

The spelling of 18916697 in words is "eighteen million, nine hundred sixteen thousand, six hundred ninety-seven".