12876991 has 4 divisors (see below), whose sum is σ = 12892552. Its totient is φ = 12861432.

The previous prime is 12876989. The next prime is 12877001. The reversal of 12876991 is 19967821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19967821 = 2297 ⋅8693.

It is a cyclic number.

It is not a de Polignac number, because 12876991 - 2¹ = 12876989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12876961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6465 + ... + 8218.

It is an arithmetic number, because the mean of its divisors is an integer number (3223138).

Almost surely, 2^12876991 is an apocalyptic number.

12876991 is a deficient number, since it is larger than the sum of its proper divisors (15561).

12876991 is an equidigital number, since it uses as much as digits as its factorization.

12876991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15560.

The product of its digits is 54432, while the sum is 43.

The square root of 12876991 is about 3588.4524519631. The cubic root of 12876991 is about 234.3894881947.

The spelling of 12876991 in words is "twelve million, eight hundred seventy-six thousand, nine hundred ninety-one".