25981089 has 8 divisors (see below), whose sum is σ = 34665120. Its totient is φ = 17308896.

The previous prime is 25981079. The next prime is 25981097. The reversal of 25981089 is 98018952.

It is a happy number.

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

It is not a de Polignac number, because 25981089 - 2⁵ = 25981057 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 25981089.

It is not an unprimeable number, because it can be changed into a prime (25981009) 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, 6349 + ... + 9605.

It is an arithmetic number, because the mean of its divisors is an integer number (4333140).

Almost surely, 2^25981089 is an apocalyptic number.

It is an amenable number.

25981089 is a deficient number, since it is larger than the sum of its proper divisors (8684031).

25981089 is a wasteful number, since it uses less digits than its factorization.

25981089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5919.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 25981089 is about 5097.1648001610. The cubic root of 25981089 is about 296.1777640824.

The spelling of 25981089 in words is "twenty-five million, nine hundred eighty-one thousand, eighty-nine".