25520897 has 2 divisors, whose sum is σ = 25520898. Its totient is φ = 25520896.

The previous prime is 25520881. The next prime is 25520909. The reversal of 25520897 is 79802552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25441936 + 78961 = 5044^2 + 281^2 .

It is a cyclic number.

It is not a de Polignac number, because 25520897 - 2⁴ = 25520881 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25520897.

It is not a weakly prime, because it can be changed into another prime (25520827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12760448 + 12760449.

It is an arithmetic number, because the mean of its divisors is an integer number (12760449).

Almost surely, 2^25520897 is an apocalyptic number.

It is an amenable number.

25520897 is a deficient number, since it is larger than the sum of its proper divisors (1).

25520897 is an equidigital number, since it uses as much as digits as its factorization.

25520897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 25520897 is about 5051.8211567711. The cubic root of 25520897 is about 294.4186463322.

The spelling of 25520897 in words is "twenty-five million, five hundred twenty thousand, eight hundred ninety-seven".