25517025 has 30 divisors (see below), whose sum is σ = 47270102. Its totient is φ = 13608000.

The previous prime is 25517021. The next prime is 25517029. The reversal of 25517025 is 52071552.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25517021) and next prime (25517029).

It can be written as a sum of positive squares in 3 ways, for example, as 746496 + 24770529 = 864^2 + 4977^2 .

It is not a de Polignac number, because 25517025 - 2² = 25517021 is a prime.

It is a super-2 number, since 2×25517025² = 1302237129701250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 25517025.

It is not an unprimeable number, because it can be changed into a prime (25517021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 4276 + ... + 8325.

Almost surely, 2^25517025 is an apocalyptic number.

25517025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25517025 is a deficient number, since it is larger than the sum of its proper divisors (21753077).

25517025 is a wasteful number, since it uses less digits than its factorization.

25517025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12623 (or 12609 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 25517025 is about 5051.4379140993. The cubic root of 25517025 is about 294.4037559641.

Adding to 25517025 its reverse (52071552), we get a palindrome (77588577).

The spelling of 25517025 in words is "twenty-five million, five hundred seventeen thousand, twenty-five".