25388261 has 4 divisors (see below), whose sum is σ = 25804524. Its totient is φ = 24972000.

The previous prime is 25388249. The next prime is 25388263. The reversal of 25388261 is 16288352.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6300100 + 19088161 = 2510^2 + 4369^2 .

It is a cyclic number.

It is not a de Polignac number, because 25388261 - 2⁶ = 25388197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25388263) 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, 208040 + ... + 208161.

It is an arithmetic number, because the mean of its divisors is an integer number (6451131).

Almost surely, 2^25388261 is an apocalyptic number.

It is an amenable number.

25388261 is a deficient number, since it is larger than the sum of its proper divisors (416263).

25388261 is an equidigital number, since it uses as much as digits as its factorization.

25388261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416262.

The product of its digits is 23040, while the sum is 35.

The square root of 25388261 is about 5038.6765127363. The cubic root of 25388261 is about 293.9077139504.

Subtracting from 25388261 its reverse (16288352), we obtain a palindrome (9099909).

The spelling of 25388261 in words is "twenty-five million, three hundred eighty-eight thousand, two hundred sixty-one".