25643791 has 2 divisors, whose sum is σ = 25643792. Its totient is φ = 25643790.

The previous prime is 25643773. The next prime is 25643831. The reversal of 25643791 is 19734652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25643791 - 2⁵ = 25643759 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25643791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25643731) 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, 12821895 + 12821896.

It is an arithmetic number, because the mean of its divisors is an integer number (12821896).

Almost surely, 2^25643791 is an apocalyptic number.

25643791 is a deficient number, since it is larger than the sum of its proper divisors (1).

25643791 is an equidigital number, since it uses as much as digits as its factorization.

25643791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 37.

The square root of 25643791 is about 5063.9698853765. The cubic root of 25643791 is about 294.8904735605.

The spelling of 25643791 in words is "twenty-five million, six hundred forty-three thousand, seven hundred ninety-one".