12491609 has 8 divisors (see below), whose sum is σ = 13497792. Its totient is φ = 11491920.

The previous prime is 12491603. The next prime is 12491627. The reversal of 12491609 is 90619421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12491609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12491603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2852 + ... + 5754.

It is an arithmetic number, because the mean of its divisors is an integer number (1687224).

Almost surely, 2^12491609 is an apocalyptic number.

It is an amenable number.

12491609 is a deficient number, since it is larger than the sum of its proper divisors (1006183).

12491609 is a wasteful number, since it uses less digits than its factorization.

12491609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3247.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 12491609 is about 3534.3470401193. The cubic root of 12491609 is about 232.0274999606.

The spelling of 12491609 in words is "twelve million, four hundred ninety-one thousand, six hundred nine".