18125 has 10 divisors (see below), whose sum is σ = 23430. Its totient is φ = 14000.

The previous prime is 18121. The next prime is 18127. The reversal of 18125 is 52181.

18125 is nontrivially palindromic in base 3.

It can be written as a sum of positive squares in 5 ways, for example, as 6889 + 11236 = 83^2 + 106^2 .

It is not a de Polignac number, because 18125 - 2² = 18121 is a prime.

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

18125 is an undulating number in base 12.

It is a Curzon number.

It is a plaindrome in base 11 and base 16.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18121) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 611 + ... + 639.

It is an arithmetic number, because the mean of its divisors is an integer number (2343).

2¹⁸¹²⁵ is an apocalyptic number.

It is an amenable number.

18125 is a deficient number, since it is larger than the sum of its proper divisors (5305).

18125 is an frugal number, since it uses more digits than its factorization.

18125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49 (or 34 counting only the distinct ones).

The product of its digits is 80, while the sum is 17.

The square root of 18125 is about 134.6291201784. The cubic root of 18125 is about 26.2679393625.

The spelling of 18125 in words is "eighteen thousand, one hundred twenty-five".