18051 has 8 divisors (see below), whose sum is σ = 26304. Its totient is φ = 10920.

The previous prime is 18049. The next prime is 18059. The reversal of 18051 is 15081.

It is a happy number.

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

It is not a de Polignac number, because 18051 - 2¹ = 18049 is a prime.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 18051.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241 + ... + 306.

It is an arithmetic number, because the mean of its divisors is an integer number (3288).

2¹⁸⁰⁵¹ is an apocalyptic number.

18051 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18051 is a deficient number, since it is larger than the sum of its proper divisors (8253).

18051 is a wasteful number, since it uses less digits than its factorization.

18051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561.

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

The square root of 18051 is about 134.3540099885. The cubic root of 18051 is about 26.2321420490.

It can be divided in two parts, 180 and 51, that multiplied together give a triangular number (9180 = T₁₃₅).

The spelling of 18051 in words is "eighteen thousand, fifty-one".