18351 has 6 divisors (see below), whose sum is σ = 26520. Its totient is φ = 12228.

The previous prime is 18341. The next prime is 18353. The reversal of 18351 is 15381.

It is a happy number.

18351 is nontrivially palindromic in base 5.

18351 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 18351 - 2⁶ = 18287 is a prime.

It is a plaindrome in base 16.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18353) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1011 + ... + 1028.

It is an arithmetic number, because the mean of its divisors is an integer number (4420).

2¹⁸³⁵¹ is an apocalyptic number.

18351 is a deficient number, since it is larger than the sum of its proper divisors (8169).

18351 is a wasteful number, since it uses less digits than its factorization.

18351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045 (or 2042 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 18351 is about 135.4658628585. The cubic root of 18351 is about 26.3766667111.

The spelling of 18351 in words is "eighteen thousand, three hundred fifty-one".