25222525 has 6 divisors (see below), whose sum is σ = 31275962. Its totient is φ = 20178000.

The previous prime is 25222471. The next prime is 25222529. The reversal of 25222525 is 52522252.

It can be written as a sum of positive squares in 3 ways, for example, as 412164 + 24810361 = 642^2 + 4981^2 .

It is not a de Polignac number, because 25222525 - 2⁷ = 25222397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 1008901 = 25222525 / (2 + 5 + 2 + 2 + 2 + 5 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25222525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25222529) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 504426 + ... + 504475.

Almost surely, 2^25222525 is an apocalyptic number.

25222525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25222525 is a deficient number, since it is larger than the sum of its proper divisors (6053437).

25222525 is a wasteful number, since it uses less digits than its factorization.

25222525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008911 (or 1008906 counting only the distinct ones).

The product of its digits is 4000, while the sum is 25.

The square root of 25222525 is about 5022.2032017831. The cubic root of 25222525 is about 293.2667684990.

Adding to 25222525 its reverse (52522252), we get a palindrome (77744777).

The spelling of 25222525 in words is "twenty-five million, two hundred twenty-two thousand, five hundred twenty-five".