25891791 has 8 divisors (see below), whose sum is σ = 34910640. Its totient is φ = 17067072.

The previous prime is 25891777. The next prime is 25891841. The reversal of 25891791 is 19719852.

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

It is a de Polignac number, because none of the positive numbers 2^k-25891791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25891711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48220 + ... + 48753.

It is an arithmetic number, because the mean of its divisors is an integer number (4363830).

Almost surely, 2^25891791 is an apocalyptic number.

25891791 is a deficient number, since it is larger than the sum of its proper divisors (9018849).

25891791 is an equidigital number, since it uses as much as digits as its factorization.

25891791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97065.

The product of its digits is 45360, while the sum is 42.

The square root of 25891791 is about 5088.3976849299. The cubic root of 25891791 is about 295.8380498003.

The spelling of 25891791 in words is "twenty-five million, eight hundred ninety-one thousand, seven hundred ninety-one".