25109 has 8 divisors (see below), whose sum is σ = 30528. Its totient is φ = 20160.

The previous prime is 25097. The next prime is 25111. The reversal of 25109 is 90152.

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

It is not a de Polignac number, because 25109 - 2¹² = 21013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

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 25109.

It is not an unprimeable number, because it can be changed into a prime (25169) 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, 14 + ... + 224.

It is an arithmetic number, because the mean of its divisors is an integer number (3816).

2²⁵¹⁰⁹ is an apocalyptic number.

It is an amenable number.

25109 is a deficient number, since it is larger than the sum of its proper divisors (5419).

25109 is a wasteful number, since it uses less digits than its factorization.

25109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 25109 is about 158.4581963800. The cubic root of 25109 is about 29.2826114953.

The spelling of 25109 in words is "twenty-five thousand, one hundred nine".