25052581 has 4 divisors (see below), whose sum is σ = 25063200. Its totient is φ = 25041964.

The previous prime is 25052579. The next prime is 25052603. The reversal of 25052581 is 18525052.

25052581 is a nontrivial binomial coefficient, being equal to C(7079, 2).

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 25052581 - 2¹ = 25052579 is a prime.

It is a super-2 number, since 2×25052581² = 1255263629523122, which contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25052981) 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, 1 + ... + 7078.

It is an arithmetic number, because the mean of its divisors is an integer number (6265800).

Almost surely, 2^25052581 is an apocalyptic number.

25052581 is the 7078-th triangular number.

25052581 is the 2360-th centered nonagonal number.

It is an amenable number.

25052581 is a deficient number, since it is larger than the sum of its proper divisors (10619).

25052581 is an equidigital number, since it uses as much as digits as its factorization.

25052581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10618.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 25052581 is about 5005.2553381421. The cubic root of 25052581 is about 292.6066273053.

The spelling of 25052581 in words is "twenty-five million, fifty-two thousand, five hundred eighty-one".