12991749 has 4 divisors (see below), whose sum is σ = 17322336. Its totient is φ = 8661164.

The previous prime is 12991747. The next prime is 12991751. The reversal of 12991749 is 94719921.

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 an interprime number because it is at equal distance from previous prime (12991747) and next prime (12991751).

It is a cyclic number.

It is not a de Polignac number, because 12991749 - 2¹ = 12991747 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12991749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12991747) 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, 2165289 + ... + 2165294.

It is an arithmetic number, because the mean of its divisors is an integer number (4330584).

Almost surely, 2^12991749 is an apocalyptic number.

It is an amenable number.

12991749 is a deficient number, since it is larger than the sum of its proper divisors (4330587).

12991749 is an equidigital number, since it uses as much as digits as its factorization.

12991749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4330586.

The product of its digits is 40824, while the sum is 42.

The square root of 12991749 is about 3604.4068860216. The cubic root of 12991749 is about 235.0837124426.

The spelling of 12991749 in words is "twelve million, nine hundred ninety-one thousand, seven hundred forty-nine".