25825691 has 2 divisors, whose sum is σ = 25825692. Its totient is φ = 25825690.

The previous prime is 25825663. The next prime is 25825729. The reversal of 25825691 is 19652852.

It is an a-pointer prime, because the next prime (25825729) can be obtained adding 25825691 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25825691 - 2²² = 21631387 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25825621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12912845 + 12912846.

It is an arithmetic number, because the mean of its divisors is an integer number (12912846).

Almost surely, 2^25825691 is an apocalyptic number.

25825691 is a deficient number, since it is larger than the sum of its proper divisors (1).

25825691 is an equidigital number, since it uses as much as digits as its factorization.

25825691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 38.

The square root of 25825691 is about 5081.8983657684. The cubic root of 25825691 is about 295.5860837169.

The spelling of 25825691 in words is "twenty-five million, eight hundred twenty-five thousand, six hundred ninety-one".