25368991 has 2 divisors, whose sum is σ = 25368992. Its totient is φ = 25368990.

The previous prime is 25368989. The next prime is 25369007. The reversal of 25368991 is 19986352.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25368991 - 2¹ = 25368989 is a prime.

Together with 25368989, it forms a pair of twin primes.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25368901) 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, 12684495 + 12684496.

It is an arithmetic number, because the mean of its divisors is an integer number (12684496).

Almost surely, 2^25368991 is an apocalyptic number.

25368991 is a deficient number, since it is larger than the sum of its proper divisors (1).

25368991 is an equidigital number, since it uses as much as digits as its factorization.

25368991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 43.

The square root of 25368991 is about 5036.7639412623. The cubic root of 25368991 is about 293.8333352816.

The spelling of 25368991 in words is "twenty-five million, three hundred sixty-eight thousand, nine hundred ninety-one".