25991079 has 16 divisors (see below), whose sum is σ = 37163520. Its totient is φ = 16099200.

The previous prime is 25991071. The next prime is 25991083. The reversal of 25991079 is 97019952.

It is not a de Polignac number, because 25991079 - 2³ = 25991071 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25991079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25991071) 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, 804 + ... + 7254.

It is an arithmetic number, because the mean of its divisors is an integer number (2322720).

Almost surely, 2^25991079 is an apocalyptic number.

25991079 is a deficient number, since it is larger than the sum of its proper divisors (11172441).

25991079 is a wasteful number, since it uses less digits than its factorization.

25991079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6550.

The product of its (nonzero) digits is 51030, while the sum is 42.

The square root of 25991079 is about 5098.1446625218. The cubic root of 25991079 is about 296.2157203655.

The spelling of 25991079 in words is "twenty-five million, nine hundred ninety-one thousand, seventy-nine".