18006971 has 2 divisors, whose sum is σ = 18006972. Its totient is φ = 18006970.

The previous prime is 18006943. The next prime is 18006973. The reversal of 18006971 is 17960081.

It is a strong prime.

It is an emirp because it is prime and its reverse (17960081) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18006971 is a prime.

Together with 18006973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18006973) 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, 9003485 + 9003486.

It is an arithmetic number, because the mean of its divisors is an integer number (9003486).

Almost surely, 2^18006971 is an apocalyptic number.

18006971 is a deficient number, since it is larger than the sum of its proper divisors (1).

18006971 is an equidigital number, since it uses as much as digits as its factorization.

18006971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 18006971 is about 4243.4621478222. The cubic root of 18006971 is about 262.1079668845.

The spelling of 18006971 in words is "eighteen million, six thousand, nine hundred seventy-one".