25816391 has 2 divisors, whose sum is σ = 25816392. Its totient is φ = 25816390.

The previous prime is 25816369. The next prime is 25816423. The reversal of 25816391 is 19361852.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25816391 - 2¹⁴ = 25800007 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 (25816321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12908195 + 12908196.

It is an arithmetic number, because the mean of its divisors is an integer number (12908196).

Almost surely, 2^25816391 is an apocalyptic number.

25816391 is a deficient number, since it is larger than the sum of its proper divisors (1).

25816391 is an equidigital number, since it uses as much as digits as its factorization.

25816391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 35.

The square root of 25816391 is about 5080.9832709821. The cubic root of 25816391 is about 295.5505986307.

The spelling of 25816391 in words is "twenty-five million, eight hundred sixteen thousand, three hundred ninety-one".