25515 has 28 divisors (see below), whose sum is σ = 52464. Its totient is φ = 11664.

The previous prime is 25471. The next prime is 25523. The reversal of 25515 is 51552.

25515 = 36² + 37² + ... + 49².

It is not a de Polignac number, because 25515 - 2¹² = 21419 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 25515.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 3642 + ... + 3648.

2²⁵⁵¹⁵ is an apocalyptic number.

25515 is an abundant number, since it is smaller than the sum of its proper divisors (26949).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26232).

25515 is an frugal number, since it uses more digits than its factorization.

25515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30 (or 15 counting only the distinct ones).

The product of its digits is 250, while the sum is 18.

The square root of 25515 is about 159.7341541437. The cubic root of 25515 is about 29.4395967917.

It can be divided in two parts, 2551 and 5, that added together give a triangular number (2556 = T₇₁).

The spelling of 25515 in words is "twenty-five thousand, five hundred fifteen".