25215005 has 4 divisors (see below), whose sum is σ = 30258012. Its totient is φ = 20172000.

The previous prime is 25214999. The next prime is 25215049. The reversal of 25215005 is 50051252.

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 14417209 + 10797796 = 3797^2 + 3286^2 .

It is not a de Polignac number, because 25215005 - 2⁴ = 25214989 is a prime.

It is a Duffinian number.

It is a Curzon number.

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, 2521496 + ... + 2521505.

It is an arithmetic number, because the mean of its divisors is an integer number (7564503).

Almost surely, 2^25215005 is an apocalyptic number.

It is an amenable number.

25215005 is a deficient number, since it is larger than the sum of its proper divisors (5043007).

25215005 is an equidigital number, since it uses as much as digits as its factorization.

25215005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5043006.

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 25215005 is about 5021.4544705693. The cubic root of 25215005 is about 293.2376201443.

Adding to 25215005 its reverse (50051252), we get a palindrome (75266257).

The spelling of 25215005 in words is "twenty-five million, two hundred fifteen thousand, five".