18045197 has 2 divisors, whose sum is σ = 18045198. Its totient is φ = 18045196.

The previous prime is 18045173. The next prime is 18045199. The reversal of 18045197 is 79154081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15319396 + 2725801 = 3914^2 + 1651^2 .

It is a cyclic number.

It is not a de Polignac number, because 18045197 - 2⁸ = 18044941 is a prime.

Together with 18045199, 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 (18045199) 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, 9022598 + 9022599.

It is an arithmetic number, because the mean of its divisors is an integer number (9022599).

Almost surely, 2^18045197 is an apocalyptic number.

It is an amenable number.

18045197 is a deficient number, since it is larger than the sum of its proper divisors (1).

18045197 is an equidigital number, since it uses as much as digits as its factorization.

18045197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 18045197 is about 4247.9638651947. The cubic root of 18045197 is about 262.2933072851.

The spelling of 18045197 in words is "eighteen million, forty-five thousand, one hundred ninety-seven".