25997599 has 2 divisors, whose sum is σ = 25997600. Its totient is φ = 25997598.

The previous prime is 25997593. The next prime is 25997611. The reversal of 25997599 is 99579952.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25997599 - 2⁹ = 25997087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25997593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12998799 + 12998800.

It is an arithmetic number, because the mean of its divisors is an integer number (12998800).

Almost surely, 2^25997599 is an apocalyptic number.

25997599 is a deficient number, since it is larger than the sum of its proper divisors (1).

25997599 is an equidigital number, since it uses as much as digits as its factorization.

25997599 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2296350, while the sum is 55.

The square root of 25997599 is about 5098.7840707369. The cubic root of 25997599 is about 296.2404873894.

It can be divided in two parts, 2 and 5997599, that added together give a square (5997601 = 2449²).

The spelling of 25997599 in words is "twenty-five million, nine hundred ninety-seven thousand, five hundred ninety-nine".