3216891 has 16 divisors (see below), whose sum is σ = 4476704. Its totient is φ = 2052864.

The previous prime is 3216887. The next prime is 3216911. The reversal of 3216891 is 1986123.

It is not a de Polignac number, because 3216891 - 2² = 3216887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3216881) 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 15 ways as a sum of consecutive naturals, for example, 7905 + ... + 8301.

It is an arithmetic number, because the mean of its divisors is an integer number (279794).

Almost surely, 2^3216891 is an apocalyptic number.

3216891 is a deficient number, since it is larger than the sum of its proper divisors (1259813).

3216891 is a wasteful number, since it uses less digits than its factorization.

3216891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510.

The product of its digits is 2592, while the sum is 30.

The square root of 3216891 is about 1793.5693463036. The cubic root of 3216891 is about 147.6200841494.

The spelling of 3216891 in words is "three million, two hundred sixteen thousand, eight hundred ninety-one".