25891651 has 4 divisors (see below), whose sum is σ = 25909704. Its totient is φ = 25873600.

The previous prime is 25891639. The next prime is 25891667. The reversal of 25891651 is 15619852.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25891651 - 2⁹ = 25891139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25891651.

It is not an unprimeable number, because it can be changed into a prime (25801651) 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 in 3 ways as a sum of consecutive naturals, for example, 6670 + ... + 9811.

It is an arithmetic number, because the mean of its divisors is an integer number (6477426).

Almost surely, 2^25891651 is an apocalyptic number.

25891651 is a deficient number, since it is larger than the sum of its proper divisors (18053).

25891651 is a wasteful number, since it uses less digits than its factorization.

25891651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18052.

The product of its digits is 21600, while the sum is 37.

The square root of 25891651 is about 5088.3839281249. The cubic root of 25891651 is about 295.8375165888.

The spelling of 25891651 in words is "twenty-five million, eight hundred ninety-one thousand, six hundred fifty-one".