12891071 has 8 divisors (see below), whose sum is σ = 13353600. Its totient is φ = 12431520.

The previous prime is 12891061. The next prime is 12891119. The reversal of 12891071 is 17019821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12891071 - 2⁶ = 12891007 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 (12891061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11525 + ... + 12593.

It is an arithmetic number, because the mean of its divisors is an integer number (1669200).

Almost surely, 2^12891071 is an apocalyptic number.

12891071 is a deficient number, since it is larger than the sum of its proper divisors (462529).

12891071 is a wasteful number, since it uses less digits than its factorization.

12891071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 12891071 is about 3590.4137644567. The cubic root of 12891071 is about 234.4748860408.

The spelling of 12891071 in words is "twelve million, eight hundred ninety-one thousand, seventy-one".