18512001 has 12 divisors (see below), whose sum is σ = 26891280. Its totient is φ = 12271320.

The previous prime is 18511979. The next prime is 18512029. The reversal of 18512001 is 10021581.

It is not a de Polignac number, because 18512001 - 2⁹ = 18511489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18512051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4135 + ... + 7356.

It is an arithmetic number, because the mean of its divisors is an integer number (2240940).

Almost surely, 2^18512001 is an apocalyptic number.

It is an amenable number.

18512001 is a deficient number, since it is larger than the sum of its proper divisors (8379279).

18512001 is a wasteful number, since it uses less digits than its factorization.

18512001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11676 (or 11673 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 18512001 is about 4302.5574952579. The cubic root of 18512001 is about 264.5358006055.

Adding to 18512001 its reverse (10021581), we get a palindrome (28533582).

The spelling of 18512001 in words is "eighteen million, five hundred twelve thousand, one".