25891261 has 8 divisors (see below), whose sum is σ = 29473344. Its totient is φ = 22513920.

The previous prime is 25891259. The next prime is 25891273. The reversal of 25891261 is 16219852.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25891261 - 2¹ = 25891259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25891211) 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 in 7 ways as a sum of consecutive naturals, for example, 50916 + ... + 51421.

It is an arithmetic number, because the mean of its divisors is an integer number (3684168).

Almost surely, 2^25891261 is an apocalyptic number.

It is an amenable number.

25891261 is a deficient number, since it is larger than the sum of its proper divisors (3582083).

25891261 is a wasteful number, since it uses less digits than its factorization.

25891261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102371.

The product of its digits is 8640, while the sum is 34.

The square root of 25891261 is about 5088.3456054006. The cubic root of 25891261 is about 295.8360312038.

It can be divided in two parts, 258 and 91261, that added together give a palindrome (91519).

The spelling of 25891261 in words is "twenty-five million, eight hundred ninety-one thousand, two hundred sixty-one".