18650197 has 2 divisors, whose sum is σ = 18650198. Its totient is φ = 18650196.

The previous prime is 18650179. The next prime is 18650213. The reversal of 18650197 is 79105681.

Together with previous prime (18650179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18610596 + 39601 = 4314^2 + 199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18650197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18650147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9325098 + 9325099.

It is an arithmetic number, because the mean of its divisors is an integer number (9325099).

Almost surely, 2^18650197 is an apocalyptic number.

It is an amenable number.

18650197 is a deficient number, since it is larger than the sum of its proper divisors (1).

18650197 is an equidigital number, since it uses as much as digits as its factorization.

18650197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 18650197 is about 4318.5873847822. The cubic root of 18650197 is about 265.1924412063.

The spelling of 18650197 in words is "eighteen million, six hundred fifty thousand, one hundred ninety-seven".