18045231 has 8 divisors (see below), whose sum is σ = 25326720. Its totient is φ = 11396952.

The previous prime is 18045199. The next prime is 18045253. The reversal of 18045231 is 13254081.

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

It is not a de Polignac number, because 18045231 - 2⁵ = 18045199 is a prime.

It is a super-2 number, since 2×18045231² = 651260723686722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18045031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158235 + ... + 158348.

It is an arithmetic number, because the mean of its divisors is an integer number (3165840).

Almost surely, 2^18045231 is an apocalyptic number.

18045231 is a deficient number, since it is larger than the sum of its proper divisors (7281489).

18045231 is a wasteful number, since it uses less digits than its factorization.

18045231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316605.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 18045231 is about 4247.9678671101. The cubic root of 18045231 is about 262.2934720190.

The spelling of 18045231 in words is "eighteen million, forty-five thousand, two hundred thirty-one".