18025331 has 4 divisors (see below), whose sum is σ = 18062832. Its totient is φ = 17987832.

The previous prime is 18025297. The next prime is 18025333. The reversal of 18025331 is 13352081.

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

It is a de Polignac number, because none of the positive numbers 2^k-18025331 is a prime.

It is a super-2 number, since 2×18025331² = 649825115319122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18025297 and 18025306.

It is not an unprimeable number, because it can be changed into a prime (18025333) 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, 18020 + ... + 18993.

It is an arithmetic number, because the mean of its divisors is an integer number (4515708).

Almost surely, 2^18025331 is an apocalyptic number.

18025331 is a deficient number, since it is larger than the sum of its proper divisors (37501).

18025331 is an equidigital number, since it uses as much as digits as its factorization.

18025331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37500.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 18025331 is about 4245.6249245547. The cubic root of 18025331 is about 262.1970188346.

The spelling of 18025331 in words is "eighteen million, twenty-five thousand, three hundred thirty-one".