25521625 has 8 divisors (see below), whose sum is σ = 31851144. Its totient is φ = 20417200.

The previous prime is 25521619. The next prime is 25521631. The reversal of 25521625 is 52612552.

It is an interprime number because it is at equal distance from previous prime (25521619) and next prime (25521631).

It can be written as a sum of positive squares in 4 ways, for example, as 8082649 + 17438976 = 2843^2 + 4176^2 .

It is not a de Polignac number, because 25521625 - 2⁷ = 25521497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25521593 and 25521602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101962 + ... + 102211.

It is an arithmetic number, because the mean of its divisors is an integer number (3981393).

Almost surely, 2^25521625 is an apocalyptic number.

25521625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25521625 is a deficient number, since it is larger than the sum of its proper divisors (6329519).

25521625 is an equidigital number, since it uses as much as digits as its factorization.

25521625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204188 (or 204178 counting only the distinct ones).

The product of its digits is 6000, while the sum is 28.

The square root of 25521625 is about 5051.8932094810. The cubic root of 25521625 is about 294.4214457993.

The spelling of 25521625 in words is "twenty-five million, five hundred twenty-one thousand, six hundred twenty-five".