18217001 has 8 divisors (see below), whose sum is σ = 20248704. Its totient is φ = 16247920.

The previous prime is 18216973. The next prime is 18217019. The reversal of 18217001 is 10071281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18217001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18217021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15041 + ... + 16206.

It is an arithmetic number, because the mean of its divisors is an integer number (2531088).

Almost surely, 2^18217001 is an apocalyptic number.

18217001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18217001 is a deficient number, since it is larger than the sum of its proper divisors (2031703).

18217001 is a wasteful number, since it uses less digits than its factorization.

18217001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31311.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 18217001 is about 4268.1378843707. The cubic root of 18217001 is about 263.1230900349.

Adding to 18217001 its reverse (10071281), we get a palindrome (28288282).

The spelling of 18217001 in words is "eighteen million, two hundred seventeen thousand, one".