25497609 has 4 divisors (see below), whose sum is σ = 33996816. Its totient is φ = 16998404.

The previous prime is 25497599. The next prime is 25497643. The reversal of 25497609 is 90679452.

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-25497609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25497679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4249599 + ... + 4249604.

It is an arithmetic number, because the mean of its divisors is an integer number (8499204).

Almost surely, 2^25497609 is an apocalyptic number.

It is an amenable number.

25497609 is a deficient number, since it is larger than the sum of its proper divisors (8499207).

25497609 is an equidigital number, since it uses as much as digits as its factorization.

25497609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8499206.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 25497609 is about 5049.5157193537. The cubic root of 25497609 is about 294.3290660430.

It can be divided in two parts, 25497 and 609, that added together give a triangular number (26106 = T₂₂₈).

The spelling of 25497609 in words is "twenty-five million, four hundred ninety-seven thousand, six hundred nine".