25181 has 6 divisors (see below), whose sum is σ = 27450. Its totient is φ = 23088.

The previous prime is 25171. The next prime is 25183. The reversal of 25181 is 18152.

It can be written as a sum of positive squares in 3 ways, for example, as 1156 + 24025 = 34^2 + 155^2 .

It is not a de Polignac number, because 25181 - 2⁶ = 25117 is a prime.

It is a super-2 number, since 2×25181² = 1268165522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 25181.

It is not an unprimeable number, because it can be changed into a prime (25183) 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, 95 + ... + 243.

It is an arithmetic number, because the mean of its divisors is an integer number (4575).

2²⁵¹⁸¹ is an apocalyptic number.

It is an amenable number.

25181 is a deficient number, since it is larger than the sum of its proper divisors (2269).

25181 is a wasteful number, since it uses less digits than its factorization.

25181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175 (or 162 counting only the distinct ones).

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

The square root of 25181 is about 158.6852230045. The cubic root of 25181 is about 29.3105740586.

The spelling of 25181 in words is "twenty-five thousand, one hundred eighty-one".