12491817 has 8 divisors (see below), whose sum is σ = 17937024. Its totient is φ = 7687248.

The previous prime is 12491807. The next prime is 12491819. The reversal of 12491817 is 71819421.

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

It is not a de Polignac number, because 12491817 - 2¹² = 12487721 is a prime.

It is a super-2 number, since 2×12491817² = 312090983922978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12491819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160113 + ... + 160190.

It is an arithmetic number, because the mean of its divisors is an integer number (2242128).

Almost surely, 2^12491817 is an apocalyptic number.

It is an amenable number.

12491817 is a deficient number, since it is larger than the sum of its proper divisors (5445207).

12491817 is a wasteful number, since it uses less digits than its factorization.

12491817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320319.

The product of its digits is 4032, while the sum is 33.

The square root of 12491817 is about 3534.3764655169. The cubic root of 12491817 is about 232.0287877971.

The spelling of 12491817 in words is "twelve million, four hundred ninety-one thousand, eight hundred seventeen".