25917109 has 4 divisors (see below), whose sum is σ = 25962604. Its totient is φ = 25871616.

The previous prime is 25917091. The next prime is 25917167. The reversal of 25917109 is 90171952.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16443025 + 9474084 = 4055^2 + 3078^2 .

It is a cyclic number.

It is not a de Polignac number, because 25917109 - 2⁵ = 25917077 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 (25917179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21882 + ... + 23035.

It is an arithmetic number, because the mean of its divisors is an integer number (6490651).

Almost surely, 2^25917109 is an apocalyptic number.

It is an amenable number.

25917109 is a deficient number, since it is larger than the sum of its proper divisors (45495).

25917109 is an equidigital number, since it uses as much as digits as its factorization.

25917109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45494.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 25917109 is about 5090.8848936113. The cubic root of 25917109 is about 295.9344457033.

The spelling of 25917109 in words is "twenty-five million, nine hundred seventeen thousand, one hundred nine".