3217891 has 2 divisors, whose sum is σ = 3217892. Its totient is φ = 3217890.

The previous prime is 3217873. The next prime is 3217931. The reversal of 3217891 is 1987123.

3217891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (1987123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3217891 - 2⁷ = 3217763 is a prime.

It is not a weakly prime, because it can be changed into another prime (3217091) 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 as a sum of consecutive naturals, namely, 1608945 + 1608946.

It is an arithmetic number, because the mean of its divisors is an integer number (1608946).

Almost surely, 2^3217891 is an apocalyptic number.

3217891 is a deficient number, since it is larger than the sum of its proper divisors (1).

3217891 is an equidigital number, since it uses as much as digits as its factorization.

3217891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 3217891 is about 1793.8480983628. The cubic root of 3217891 is about 147.6353789160.

The spelling of 3217891 in words is "three million, two hundred seventeen thousand, eight hundred ninety-one".