3221891 has 4 divisors (see below), whose sum is σ = 3411432. Its totient is φ = 3032352.

The previous prime is 3221819. The next prime is 3221899. The reversal of 3221891 is 1981223.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1981223 = 337 ⋅5879.

It is a cyclic number.

It is not a de Polignac number, because 3221891 - 2¹⁴ = 3205507 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3221891.

It is not an unprimeable number, because it can be changed into a prime (3221899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94745 + ... + 94778.

It is an arithmetic number, because the mean of its divisors is an integer number (852858).

Almost surely, 2^3221891 is an apocalyptic number.

3221891 is a deficient number, since it is larger than the sum of its proper divisors (189541).

3221891 is a wasteful number, since it uses less digits than its factorization.

3221891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189540.

The product of its digits is 864, while the sum is 26.

The square root of 3221891 is about 1794.9626737066. The cubic root of 3221891 is about 147.6965263149.

The spelling of 3221891 in words is "three million, two hundred twenty-one thousand, eight hundred ninety-one".