25985791 has 16 divisors (see below), whose sum is σ = 29405376. Its totient is φ = 22784256.

The previous prime is 25985761. The next prime is 25985797. The reversal of 25985791 is 19758952.

It is a cyclic number.

It is not a de Polignac number, because 25985791 - 2¹⁹ = 25461503 is a prime.

It is a super-2 number, since 2×25985791² = 1350522667791362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25985797) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69481 + ... + 69853.

It is an arithmetic number, because the mean of its divisors is an integer number (1837836).

Almost surely, 2^25985791 is an apocalyptic number.

25985791 is a deficient number, since it is larger than the sum of its proper divisors (3419585).

25985791 is a wasteful number, since it uses less digits than its factorization.

25985791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642.

The product of its digits is 226800, while the sum is 46.

The square root of 25985791 is about 5097.6260160981. The cubic root of 25985791 is about 296.1956302034.

The spelling of 25985791 in words is "twenty-five million, nine hundred eighty-five thousand, seven hundred ninety-one".