25420391 has 2 divisors, whose sum is σ = 25420392. Its totient is φ = 25420390.

The previous prime is 25420379. The next prime is 25420399. The reversal of 25420391 is 19302452.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25420391 - 2²² = 21226087 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25420391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25420399) 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, 12710195 + 12710196.

It is an arithmetic number, because the mean of its divisors is an integer number (12710196).

Almost surely, 2^25420391 is an apocalyptic number.

25420391 is a deficient number, since it is larger than the sum of its proper divisors (1).

25420391 is an equidigital number, since it uses as much as digits as its factorization.

25420391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 25420391 is about 5041.8638418744. The cubic root of 25420391 is about 294.0316462148.

The spelling of 25420391 in words is "twenty-five million, four hundred twenty thousand, three hundred ninety-one".