12671691 has 4 divisors (see below), whose sum is σ = 16895592. Its totient is φ = 8447792.

The previous prime is 12671683. The next prime is 12671719. The reversal of 12671691 is 19617621.

12671691 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12671691 - 2³ = 12671683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12671621) 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, 2111946 + ... + 2111951.

It is an arithmetic number, because the mean of its divisors is an integer number (4223898).

Almost surely, 2^12671691 is an apocalyptic number.

12671691 is a deficient number, since it is larger than the sum of its proper divisors (4223901).

12671691 is an equidigital number, since it uses as much as digits as its factorization.

12671691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4223900.

The product of its digits is 4536, while the sum is 33.

The square root of 12671691 is about 3559.7318719252. The cubic root of 12671691 is about 233.1371723238.

It can be divided in two parts, 126 and 71691, that added together give a palindrome (71817).

The spelling of 12671691 in words is "twelve million, six hundred seventy-one thousand, six hundred ninety-one".