25512505 has 4 divisors (see below), whose sum is σ = 30615012. Its totient is φ = 20410000.

The previous prime is 25512479. The next prime is 25512517. The reversal of 25512505 is 50521552.

It is a happy number.

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 10582009 + 14930496 = 3253^2 + 3864^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25512505 is a prime.

It is a super-2 number, since 2×25512505² = 1301775822750050, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 25512505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2551246 + ... + 2551255.

It is an arithmetic number, because the mean of its divisors is an integer number (7653753).

Almost surely, 2^25512505 is an apocalyptic number.

It is an amenable number.

25512505 is a deficient number, since it is larger than the sum of its proper divisors (5102507).

25512505 is an equidigital number, since it uses as much as digits as its factorization.

25512505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5102506.

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 25512505 is about 5050.9904969224. The cubic root of 25512505 is about 294.3863717071.

The spelling of 25512505 in words is "twenty-five million, five hundred twelve thousand, five hundred five".