25211225 has 12 divisors (see below), whose sum is σ = 33667116. Its totient is φ = 18617280.

The previous prime is 25211213. The next prime is 25211227. The reversal of 25211225 is 52211252.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 784 + 25210441 = 28^2 + 5021^2 .

It is not a de Polignac number, because 25211225 - 2⁴ = 25211209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25211197 and 25211206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25211227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38462 + ... + 39111.

It is an arithmetic number, because the mean of its divisors is an integer number (2805593).

Almost surely, 2^25211225 is an apocalyptic number.

25211225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25211225 is a deficient number, since it is larger than the sum of its proper divisors (8455891).

25211225 is a wasteful number, since it uses less digits than its factorization.

25211225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77596 (or 77591 counting only the distinct ones).

The product of its digits is 400, while the sum is 20.

The square root of 25211225 is about 5021.0780714902. The cubic root of 25211225 is about 293.2229662561. Note that the first 3 decimals are identical.

Adding to 25211225 its reverse (52211252), we get a palindrome (77422477).

The spelling of 25211225 in words is "twenty-five million, two hundred eleven thousand, two hundred twenty-five".