18545497 has 2 divisors, whose sum is σ = 18545498. Its totient is φ = 18545496.

The previous prime is 18545479. The next prime is 18545503. The reversal of 18545497 is 79454581.

Together with previous prime (18545479) 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., 18156121 + 389376 = 4261^2 + 624^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18545497 is a prime.

It is not a weakly prime, because it can be changed into another prime (18545467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9272748 + 9272749.

It is an arithmetic number, because the mean of its divisors is an integer number (9272749).

Almost surely, 2^18545497 is an apocalyptic number.

It is an amenable number.

18545497 is a deficient number, since it is larger than the sum of its proper divisors (1).

18545497 is an equidigital number, since it uses as much as digits as its factorization.

18545497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 43.

The square root of 18545497 is about 4306.4483045777. The cubic root of 18545497 is about 264.6952566647.

The spelling of 18545497 in words is "eighteen million, five hundred forty-five thousand, four hundred ninety-seven".