18017971 has 4 divisors (see below), whose sum is σ = 18093600. Its totient is φ = 17942344.

The previous prime is 18017959. The next prime is 18017981. The reversal of 18017971 is 17971081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18017971 - 2⁷ = 18017843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18017911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37456 + ... + 37933.

It is an arithmetic number, because the mean of its divisors is an integer number (4523400).

Almost surely, 2^18017971 is an apocalyptic number.

18017971 is a deficient number, since it is larger than the sum of its proper divisors (75629).

18017971 is an equidigital number, since it uses as much as digits as its factorization.

18017971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75628.

The product of its (nonzero) digits is 3528, while the sum is 34.

The square root of 18017971 is about 4244.7580614212. The cubic root of 18017971 is about 262.1613277143.

The spelling of 18017971 in words is "eighteen million, seventeen thousand, nine hundred seventy-one".