18371 has 2 divisors, whose sum is σ = 18372. Its totient is φ = 18370.

The previous prime is 18367. The next prime is 18379. The reversal of 18371 is 17381.

18371 is nontrivially palindromic in base 9.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18371 - 2² = 18367 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (18379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9185 + 9186.

It is an arithmetic number, because the mean of its divisors is an integer number (9186).

2¹⁸³⁷¹ is an apocalyptic number.

18371 is a deficient number, since it is larger than the sum of its proper divisors (1).

18371 is an equidigital number, since it uses as much as digits as its factorization.

18371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168, while the sum is 20.

The square root of 18371 is about 135.5396620920. The cubic root of 18371 is about 26.3862455134.

Subtracting from 18371 its reverse (17381), we obtain a triangular number (990 = T₄₄).

The spelling of 18371 in words is "eighteen thousand, three hundred seventy-one".