25522561 has 2 divisors, whose sum is σ = 25522562. Its totient is φ = 25522560.

The previous prime is 25522537. The next prime is 25522577. The reversal of 25522561 is 16522552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25310961 + 211600 = 5031^2 + 460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25522561 is a prime.

It is a super-2 number, since 2×25522561² = 1302802239997442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25522501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12761280 + 12761281.

It is an arithmetic number, because the mean of its divisors is an integer number (12761281).

Almost surely, 2^25522561 is an apocalyptic number.

It is an amenable number.

25522561 is a deficient number, since it is larger than the sum of its proper divisors (1).

25522561 is an equidigital number, since it uses as much as digits as its factorization.

25522561 is an evil number, because the sum of its binary digits is even.

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

The square root of 25522561 is about 5051.9858471694. The cubic root of 25522561 is about 294.4250450360.

Subtracting from 25522561 its reverse (16522552), we obtain a palindrome (9000009).

The spelling of 25522561 in words is "twenty-five million, five hundred twenty-two thousand, five hundred sixty-one".