25497109 has 4 divisors (see below), whose sum is σ = 27815040. Its totient is φ = 23179180.

The previous prime is 25497103. The next prime is 25497113. The reversal of 25497109 is 90179452.

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 a de Polignac number, because none of the positive numbers 2^k-25497109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25497103) 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, 1158949 + ... + 1158970.

It is an arithmetic number, because the mean of its divisors is an integer number (6953760).

Almost surely, 2^25497109 is an apocalyptic number.

It is an amenable number.

25497109 is a deficient number, since it is larger than the sum of its proper divisors (2317931).

25497109 is a wasteful number, since it uses less digits than its factorization.

25497109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2317930.

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

The square root of 25497109 is about 5049.4662094126. The cubic root of 25497109 is about 294.3271421306.

The spelling of 25497109 in words is "twenty-five million, four hundred ninety-seven thousand, one hundred nine".