25805291 has 2 divisors, whose sum is σ = 25805292. Its totient is φ = 25805290.

The previous prime is 25805267. The next prime is 25805309. The reversal of 25805291 is 19250852.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25805291 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25805231) 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, 12902645 + 12902646.

It is an arithmetic number, because the mean of its divisors is an integer number (12902646).

Almost surely, 2^25805291 is an apocalyptic number.

25805291 is a deficient number, since it is larger than the sum of its proper divisors (1).

25805291 is an equidigital number, since it uses as much as digits as its factorization.

25805291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 25805291 is about 5079.8908452840. The cubic root of 25805291 is about 295.5082343057.

The spelling of 25805291 in words is "twenty-five million, eight hundred five thousand, two hundred ninety-one".