12891065 has 8 divisors (see below), whose sum is σ = 16875648. Its totient is φ = 9375280.

The previous prime is 12891061. The next prime is 12891119. The reversal of 12891065 is 56019821.

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

It is not a de Polignac number, because 12891065 - 2² = 12891061 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12891061) 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 7 ways as a sum of consecutive naturals, for example, 117137 + ... + 117246.

It is an arithmetic number, because the mean of its divisors is an integer number (2109456).

Almost surely, 2^12891065 is an apocalyptic number.

It is an amenable number.

12891065 is a deficient number, since it is larger than the sum of its proper divisors (3984583).

12891065 is a wasteful number, since it uses less digits than its factorization.

12891065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234399.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 12891065 is about 3590.4129288983. The cubic root of 12891065 is about 234.4748496629.

The spelling of 12891065 in words is "twelve million, eight hundred ninety-one thousand, sixty-five".