25261391 has 2 divisors, whose sum is σ = 25261392. Its totient is φ = 25261390.

The previous prime is 25261361. The next prime is 25261399. The reversal of 25261391 is 19316252.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25261391 - 2²² = 21067087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25261399) 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, 12630695 + 12630696.

It is an arithmetic number, because the mean of its divisors is an integer number (12630696).

Almost surely, 2^25261391 is an apocalyptic number.

25261391 is a deficient number, since it is larger than the sum of its proper divisors (1).

25261391 is an equidigital number, since it uses as much as digits as its factorization.

25261391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 29.

The square root of 25261391 is about 5026.0711296200. The cubic root of 25261391 is about 293.4173251501.

It can be divided in two parts, 25261 and 391, that added together give a palindrome (25652).

The spelling of 25261391 in words is "twenty-five million, two hundred sixty-one thousand, three hundred ninety-one".