25947191 has 2 divisors, whose sum is σ = 25947192. Its totient is φ = 25947190.

The previous prime is 25947169. The next prime is 25947221. The reversal of 25947191 is 19174952.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25947191 - 2¹⁸ = 25685047 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25947121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12973595 + 12973596.

It is an arithmetic number, because the mean of its divisors is an integer number (12973596).

Almost surely, 2^25947191 is an apocalyptic number.

25947191 is a deficient number, since it is larger than the sum of its proper divisors (1).

25947191 is an equidigital number, since it uses as much as digits as its factorization.

25947191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 38.

The square root of 25947191 is about 5093.8385329729. The cubic root of 25947191 is about 296.0488985140.

The spelling of 25947191 in words is "twenty-five million, nine hundred forty-seven thousand, one hundred ninety-one".