25479109 has 4 divisors (see below), whose sum is σ = 25519500. Its totient is φ = 25438720.

The previous prime is 25479089. The next prime is 25479119. The reversal of 25479109 is 90197452.

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 21390625 + 4088484 = 4625^2 + 2022^2 .

It is a cyclic number.

It is not a de Polignac number, because 25479109 - 2¹³ = 25470917 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 (25479119) 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, 19234 + ... + 20515.

It is an arithmetic number, because the mean of its divisors is an integer number (6379875).

Almost surely, 2^25479109 is an apocalyptic number.

It is an amenable number.

25479109 is a deficient number, since it is larger than the sum of its proper divisors (40391).

25479109 is an equidigital number, since it uses as much as digits as its factorization.

25479109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40390.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 25479109 is about 5047.6835281147. The cubic root of 25479109 is about 294.2578645281.

The spelling of 25479109 in words is "twenty-five million, four hundred seventy-nine thousand, one hundred nine".