25887791 has 2 divisors, whose sum is σ = 25887792. Its totient is φ = 25887790.

The previous prime is 25887781. The next prime is 25887833. The reversal of 25887791 is 19778852.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25887791 - 2⁶ = 25887727 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25887751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12943895 + 12943896.

It is an arithmetic number, because the mean of its divisors is an integer number (12943896).

Almost surely, 2^25887791 is an apocalyptic number.

25887791 is a deficient number, since it is larger than the sum of its proper divisors (1).

25887791 is an equidigital number, since it uses as much as digits as its factorization.

25887791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 47.

The square root of 25887791 is about 5088.0046187086. The cubic root of 25887791 is about 295.8228144290.

Subtracting from 25887791 its sum of digits (47), we obtain a square (25887744 = 5088²).

The spelling of 25887791 in words is "twenty-five million, eight hundred eighty-seven thousand, seven hundred ninety-one".