25813591 has 2 divisors, whose sum is σ = 25813592. Its totient is φ = 25813590.

The previous prime is 25813577. The next prime is 25813657. The reversal of 25813591 is 19531852.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25813591 - 2⁹ = 25813079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25813511) 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, 12906795 + 12906796.

It is an arithmetic number, because the mean of its divisors is an integer number (12906796).

Almost surely, 2^25813591 is an apocalyptic number.

25813591 is a deficient number, since it is larger than the sum of its proper divisors (1).

25813591 is an equidigital number, since it uses as much as digits as its factorization.

25813591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 34.

The square root of 25813591 is about 5080.7077262917. The cubic root of 25813591 is about 295.5399132797.

The spelling of 25813591 in words is "twenty-five million, eight hundred thirteen thousand, five hundred ninety-one".