12491645 has 16 divisors (see below), whose sum is σ = 16467840. Its totient is φ = 9054144.

The previous prime is 12491627. The next prime is 12491693. The reversal of 12491645 is 54619421.

It is a cyclic number.

It is not a de Polignac number, because 12491645 - 2⁶ = 12491581 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 674 + ... + 5043.

It is an arithmetic number, because the mean of its divisors is an integer number (1029240).

Almost surely, 2^12491645 is an apocalyptic number.

It is an amenable number.

12491645 is a deficient number, since it is larger than the sum of its proper divisors (3976195).

12491645 is a wasteful number, since it uses less digits than its factorization.

12491645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5764.

The product of its digits is 8640, while the sum is 32.

The square root of 12491645 is about 3534.3521329941. The cubic root of 12491645 is about 232.0277228564.

The spelling of 12491645 in words is "twelve million, four hundred ninety-one thousand, six hundred forty-five".