18012971 has 2 divisors, whose sum is σ = 18012972. Its totient is φ = 18012970.

The previous prime is 18012961. The next prime is 18012983. The reversal of 18012971 is 17921081.

It is a weak prime.

It is an emirp because it is prime and its reverse (17921081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18012971 - 2²² = 13818667 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18012901) 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, 9006485 + 9006486.

It is an arithmetic number, because the mean of its divisors is an integer number (9006486).

Almost surely, 2^18012971 is an apocalyptic number.

18012971 is a deficient number, since it is larger than the sum of its proper divisors (1).

18012971 is an equidigital number, since it uses as much as digits as its factorization.

18012971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 18012971 is about 4244.1690588383. The cubic root of 18012971 is about 262.1370754848.

The spelling of 18012971 in words is "eighteen million, twelve thousand, nine hundred seventy-one".