18025121 has 4 divisors (see below), whose sum is σ = 18126000. Its totient is φ = 17924244.

The previous prime is 18025109. The next prime is 18025157. The reversal of 18025121 is 12152081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18025121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18025093 and 18025102.

It is not an unprimeable number, because it can be changed into a prime (18025171) 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, 50171 + ... + 50528.

It is an arithmetic number, because the mean of its divisors is an integer number (4531500).

Almost surely, 2^18025121 is an apocalyptic number.

It is an amenable number.

18025121 is a deficient number, since it is larger than the sum of its proper divisors (100879).

18025121 is a wasteful number, since it uses less digits than its factorization.

18025121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100878.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 18025121 is about 4245.6001931411. The cubic root of 18025121 is about 262.1960006085.

The spelling of 18025121 in words is "eighteen million, twenty-five thousand, one hundred twenty-one".