25540109 has 4 divisors (see below), whose sum is σ = 29188704. Its totient is φ = 21891516.

The previous prime is 25540079. The next prime is 25540111. The reversal of 25540109 is 90104552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25540109 - 2¹² = 25536013 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 (25540139) 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, 1824287 + ... + 1824300.

It is an arithmetic number, because the mean of its divisors is an integer number (7297176).

Almost surely, 2^25540109 is an apocalyptic number.

It is an amenable number.

25540109 is a deficient number, since it is larger than the sum of its proper divisors (3648595).

25540109 is an equidigital number, since it uses as much as digits as its factorization.

25540109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3648594.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 25540109 is about 5053.7222915392. The cubic root of 25540109 is about 294.4925067490.

The spelling of 25540109 in words is "twenty-five million, five hundred forty thousand, one hundred nine".