25099 has 4 divisors (see below), whose sum is σ = 26440. Its totient is φ = 23760.

The previous prime is 25097. The next prime is 25111. The reversal of 25099 is 99052.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25099 - 2¹ = 25097 is a prime.

It is a Duffinian number.

25099 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (25097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642 + ... + 679.

It is an arithmetic number, because the mean of its divisors is an integer number (6610).

2²⁵⁰⁹⁹ is an apocalyptic number.

25099 is a deficient number, since it is larger than the sum of its proper divisors (1341).

25099 is a wasteful number, since it uses less digits than its factorization.

25099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 25099 is about 158.4266391741. The cubic root of 25099 is about 29.2787235800.

The spelling of 25099 in words is "twenty-five thousand, ninety-nine".