25505245 has 4 divisors (see below), whose sum is σ = 30606300. Its totient is φ = 20404192.

The previous prime is 25505231. The next prime is 25505261. The reversal of 25505245 is 54250552.

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 14884164 + 10621081 = 3858^2 + 3259^2 .

It is a cyclic number.

It is not a de Polignac number, because 25505245 - 2⁵ = 25505213 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2550520 + ... + 2550529.

It is an arithmetic number, because the mean of its divisors is an integer number (7651575).

Almost surely, 2^25505245 is an apocalyptic number.

It is an amenable number.

25505245 is a deficient number, since it is larger than the sum of its proper divisors (5101055).

25505245 is an equidigital number, since it uses as much as digits as its factorization.

25505245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5101054.

The product of its (nonzero) digits is 10000, while the sum is 28.

The square root of 25505245 is about 5050.2717748652. The cubic root of 25505245 is about 294.3584449078.

Adding to 25505245 its reverse (54250552), we get a palindrome (79755797).

The spelling of 25505245 in words is "twenty-five million, five hundred five thousand, two hundred forty-five".