25331609 has 4 divisors (see below), whose sum is σ = 25499520. Its totient is φ = 25163700.

The previous prime is 25331599. The next prime is 25331627. The reversal of 25331609 is 90613352.

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 25331609 - 2⁸ = 25331353 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (25331659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83729 + ... + 84030.

It is an arithmetic number, because the mean of its divisors is an integer number (6374880).

Almost surely, 2^25331609 is an apocalyptic number.

It is an amenable number.

25331609 is a deficient number, since it is larger than the sum of its proper divisors (167911).

25331609 is a wasteful number, since it uses less digits than its factorization.

25331609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167910.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 25331609 is about 5033.0516587852. The cubic root of 25331609 is about 293.6889401381.

The spelling of 25331609 in words is "twenty-five million, three hundred thirty-one thousand, six hundred nine".