25961597 has 2 divisors, whose sum is σ = 25961598. Its totient is φ = 25961596.

The previous prime is 25961563. The next prime is 25961599. The reversal of 25961597 is 79516952.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22174681 + 3786916 = 4709^2 + 1946^2 .

It is a cyclic number.

It is not a de Polignac number, because 25961597 - 2¹⁰ = 25960573 is a prime.

Together with 25961599, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25961599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12980798 + 12980799.

It is an arithmetic number, because the mean of its divisors is an integer number (12980799).

Almost surely, 2^25961597 is an apocalyptic number.

It is an amenable number.

25961597 is a deficient number, since it is larger than the sum of its proper divisors (1).

25961597 is an equidigital number, since it uses as much as digits as its factorization.

25961597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 170100, while the sum is 44.

The square root of 25961597 is about 5095.2523980663. The cubic root of 25961597 is about 296.1036776149.

The spelling of 25961597 in words is "twenty-five million, nine hundred sixty-one thousand, five hundred ninety-seven".