12670991 has 4 divisors (see below), whose sum is σ = 12679992. Its totient is φ = 12661992.

The previous prime is 12670963. The next prime is 12670997. The reversal of 12670991 is 19907621.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 19907621 = 1367 ⋅14563.

It is a cyclic number.

It is not a de Polignac number, because 12670991 - 2¹⁰ = 12669967 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 (12670997) 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, 1880 + ... + 5373.

It is an arithmetic number, because the mean of its divisors is an integer number (3169998).

Almost surely, 2^12670991 is an apocalyptic number.

12670991 is a deficient number, since it is larger than the sum of its proper divisors (9001).

12670991 is an equidigital number, since it uses as much as digits as its factorization.

12670991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9000.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 12670991 is about 3559.6335485552. The cubic root of 12670991 is about 233.1328793155.

It can be divided in two parts, 126 and 70991, that added together give a palindrome (71117).

The spelling of 12670991 in words is "twelve million, six hundred seventy thousand, nine hundred ninety-one".