13217891 has 8 divisors (see below), whose sum is σ = 14188464. Its totient is φ = 12268800.

The previous prime is 13217861. The next prime is 13217903. The reversal of 13217891 is 19871231.

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 13217891 - 2²² = 9023587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13217821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4085 + ... + 6566.

It is an arithmetic number, because the mean of its divisors is an integer number (1773558).

Almost surely, 2^13217891 is an apocalyptic number.

13217891 is a deficient number, since it is larger than the sum of its proper divisors (970573).

13217891 is a wasteful number, since it uses less digits than its factorization.

13217891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10741.

The product of its digits is 3024, while the sum is 32.

The square root of 13217891 is about 3635.6417590296. The cubic root of 13217891 is about 236.4398755364.

The spelling of 13217891 in words is "thirteen million, two hundred seventeen thousand, eight hundred ninety-one".