12649191 has 16 divisors (see below), whose sum is σ = 17539200. Its totient is φ = 8099168.

The previous prime is 12649183. The next prime is 12649199. The reversal of 12649191 is 19194621.

It is an interprime number because it is at equal distance from previous prime (12649183) and next prime (12649199).

It is a cyclic number.

It is not a de Polignac number, because 12649191 - 2³ = 12649183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12649199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29980 + ... + 30398.

It is an arithmetic number, because the mean of its divisors is an integer number (1096200).

Almost surely, 2^12649191 is an apocalyptic number.

12649191 is a deficient number, since it is larger than the sum of its proper divisors (4890009).

12649191 is a wasteful number, since it uses less digits than its factorization.

12649191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798.

The product of its digits is 3888, while the sum is 33.

The square root of 12649191 is about 3556.5701174024. The cubic root of 12649191 is about 232.9991035596. Note that the first 3 decimals are identical.

The spelling of 12649191 in words is "twelve million, six hundred forty-nine thousand, one hundred ninety-one".