18501 has 8 divisors (see below), whose sum is σ = 28224. Its totient is φ = 10560.

The previous prime is 18493. The next prime is 18503. The reversal of 18501 is 10581.

It is a happy number.

18501 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 18501 - 2³ = 18493 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

18501 is a lucky number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 420 + ... + 461.

It is an arithmetic number, because the mean of its divisors is an integer number (3528).

2¹⁸⁵⁰¹ is an apocalyptic number.

It is an amenable number.

18501 is a deficient number, since it is larger than the sum of its proper divisors (9723).

18501 is an equidigital number, since it uses as much as digits as its factorization.

18501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 18501 is about 136.0183811108. The cubic root of 18501 is about 26.4483388929.

The spelling of 18501 in words is "eighteen thousand, five hundred one".