12716991 has 24 divisors (see below), whose sum is σ = 21219744. Its totient is φ = 7188480.

The previous prime is 12716989. The next prime is 12717007. The reversal of 12716991 is 19961721.

It is not a de Polignac number, because 12716991 - 2¹ = 12716989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12716981) 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 23 ways as a sum of consecutive naturals, for example, 5071 + ... + 7151.

It is an arithmetic number, because the mean of its divisors is an integer number (884156).

Almost surely, 2^12716991 is an apocalyptic number.

12716991 is a deficient number, since it is larger than the sum of its proper divisors (8502753).

12716991 is a wasteful number, since it uses less digits than its factorization.

12716991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2191 (or 2188 counting only the distinct ones).

The product of its digits is 6804, while the sum is 36.

The square root of 12716991 is about 3566.0890342222. The cubic root of 12716991 is about 233.4146557808.

It can be divided in two parts, 127169 and 91, that added together give a triangular number (127260 = T₅₀₄).

The spelling of 12716991 in words is "twelve million, seven hundred sixteen thousand, nine hundred ninety-one".