25525681 has 2 divisors, whose sum is σ = 25525682. Its totient is φ = 25525680.

The previous prime is 25525673. The next prime is 25525693. The reversal of 25525681 is 18652552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25090081 + 435600 = 5009^2 + 660^2 .

It is a cyclic number.

It is not a de Polignac number, because 25525681 - 2³ = 25525673 is a prime.

It is a super-2 number, since 2×25525681² = 1303120781027522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25525081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12762840 + 12762841.

It is an arithmetic number, because the mean of its divisors is an integer number (12762841).

Almost surely, 2^25525681 is an apocalyptic number.

It is an amenable number.

25525681 is a deficient number, since it is larger than the sum of its proper divisors (1).

25525681 is an equidigital number, since it uses as much as digits as its factorization.

25525681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24000, while the sum is 34.

The square root of 25525681 is about 5052.2946271966. The cubic root of 25525681 is about 294.4370418560.

The spelling of 25525681 in words is "twenty-five million, five hundred twenty-five thousand, six hundred eighty-one".