18657097 has 2 divisors, whose sum is σ = 18657098. Its totient is φ = 18657096.

The previous prime is 18657083. The next prime is 18657101. The reversal of 18657097 is 79075681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18627856 + 29241 = 4316^2 + 171^2 .

It is an emirp because it is prime and its reverse (79075681) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18657097 is a prime.

It is not a weakly prime, because it can be changed into another prime (18657017) 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, 9328548 + 9328549.

It is an arithmetic number, because the mean of its divisors is an integer number (9328549).

Almost surely, 2^18657097 is an apocalyptic number.

It is an amenable number.

18657097 is a deficient number, since it is larger than the sum of its proper divisors (1).

18657097 is an equidigital number, since it uses as much as digits as its factorization.

18657097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 18657097 is about 4319.3861832441. The cubic root of 18657097 is about 265.2251415264.

The spelling of 18657097 in words is "eighteen million, six hundred fifty-seven thousand, ninety-seven".