25813391 has 2 divisors, whose sum is σ = 25813392. Its totient is φ = 25813390.

The previous prime is 25813379. The next prime is 25813409. The reversal of 25813391 is 19331852.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25813391 is a 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 (25813301) 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, 12906695 + 12906696.

It is an arithmetic number, because the mean of its divisors is an integer number (12906696).

Almost surely, 2^25813391 is an apocalyptic number.

25813391 is a deficient number, since it is larger than the sum of its proper divisors (1).

25813391 is an equidigital number, since it uses as much as digits as its factorization.

25813391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 32.

The square root of 25813391 is about 5080.6880439563. The cubic root of 25813391 is about 295.5391500108.

The spelling of 25813391 in words is "twenty-five million, eight hundred thirteen thousand, three hundred ninety-one".