25288261 has 8 divisors (see below), whose sum is σ = 26655480. Its totient is φ = 23954112.

The previous prime is 25288229. The next prime is 25288301. The reversal of 25288261 is 16288252.

It can be written as a sum of positive squares in 4 ways, for example, as 12285025 + 13003236 = 3505^2 + 3606^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 25288261 - 2⁵ = 25288229 is a prime.

It is a super-2 number, since 2×25288261² = 1278992288808242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25283261) 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, 6690 + ... + 9763.

It is an arithmetic number, because the mean of its divisors is an integer number (3331935).

Almost surely, 2^25288261 is an apocalyptic number.

It is an amenable number.

25288261 is a deficient number, since it is larger than the sum of its proper divisors (1367219).

25288261 is a wasteful number, since it uses less digits than its factorization.

25288261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16535.

The product of its digits is 15360, while the sum is 34.

The square root of 25288261 is about 5028.7434812287. The cubic root of 25288261 is about 293.5213221916.

Subtracting from 25288261 its reverse (16288252), we obtain a palindrome (9000009).

The spelling of 25288261 in words is "twenty-five million, two hundred eighty-eight thousand, two hundred sixty-one".