18005601 has 32 divisors (see below), whose sum is σ = 26611200. Its totient is φ = 10782720.

The previous prime is 18005593. The next prime is 18005621. The reversal of 18005601 is 10650081.

It is not a de Polignac number, because 18005601 - 2³ = 18005593 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18005621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 165135 + ... + 165243.

It is an arithmetic number, because the mean of its divisors is an integer number (831600).

Almost surely, 2^18005601 is an apocalyptic number.

It is an amenable number.

18005601 is a deficient number, since it is larger than the sum of its proper divisors (8605599).

18005601 is a wasteful number, since it uses less digits than its factorization.

18005601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 18005601 is about 4243.3007199585. The cubic root of 18005601 is about 262.1013195140.

Adding to 18005601 its reverse (10650081), we get a palindrome (28655682).

The spelling of 18005601 in words is "eighteen million, five thousand, six hundred one".