25905391 has 2 divisors, whose sum is σ = 25905392. Its totient is φ = 25905390.

The previous prime is 25905377. The next prime is 25905401. The reversal of 25905391 is 19350952.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25905391 - 2⁵ = 25905359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25905301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12952695 + 12952696.

It is an arithmetic number, because the mean of its divisors is an integer number (12952696).

Almost surely, 2^25905391 is an apocalyptic number.

25905391 is a deficient number, since it is larger than the sum of its proper divisors (1).

25905391 is an equidigital number, since it uses as much as digits as its factorization.

25905391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12150, while the sum is 34.

The square root of 25905391 is about 5089.7338830237. The cubic root of 25905391 is about 295.8898383283.

The spelling of 25905391 in words is "twenty-five million, nine hundred five thousand, three hundred ninety-one".