18197671 has 2 divisors, whose sum is σ = 18197672. Its totient is φ = 18197670.

The previous prime is 18197657. The next prime is 18197693. The reversal of 18197671 is 17679181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18197671 - 2¹¹ = 18195623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18197771) 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, 9098835 + 9098836.

It is an arithmetic number, because the mean of its divisors is an integer number (9098836).

Almost surely, 2^18197671 is an apocalyptic number.

18197671 is a deficient number, since it is larger than the sum of its proper divisors (1).

18197671 is an equidigital number, since it uses as much as digits as its factorization.

18197671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 40.

The square root of 18197671 is about 4265.8728297970. The cubic root of 18197671 is about 263.0299907488.

The spelling of 18197671 in words is "eighteen million, one hundred ninety-seven thousand, six hundred seventy-one".