25705391 has 2 divisors, whose sum is σ = 25705392. Its totient is φ = 25705390.

The previous prime is 25705387. The next prime is 25705403. The reversal of 25705391 is 19350752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25705391 - 2² = 25705387 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 (25705591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12852695 + 12852696.

It is an arithmetic number, because the mean of its divisors is an integer number (12852696).

Almost surely, 2^25705391 is an apocalyptic number.

25705391 is a deficient number, since it is larger than the sum of its proper divisors (1).

25705391 is an equidigital number, since it uses as much as digits as its factorization.

25705391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 25705391 is about 5070.0484218595. The cubic root of 25705391 is about 295.1264075713.

The spelling of 25705391 in words is "twenty-five million, seven hundred five thousand, three hundred ninety-one".