3221566 has 4 divisors (see below), whose sum is σ = 4832352. Its totient is φ = 1610782.

The previous prime is 3221557. The next prime is 3221567. The reversal of 3221566 is 6651223.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 3221566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3221567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805390 + ... + 805393.

It is an arithmetic number, because the mean of its divisors is an integer number (1208088).

Almost surely, 2^3221566 is an apocalyptic number.

3221566 is a deficient number, since it is larger than the sum of its proper divisors (1610786).

3221566 is a wasteful number, since it uses less digits than its factorization.

3221566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610785.

The product of its digits is 2160, while the sum is 25.

The square root of 3221566 is about 1794.8721402930. The cubic root of 3221566 is about 147.6915599783.

Adding to 3221566 its reverse (6651223), we get a palindrome (9872789).

The spelling of 3221566 in words is "three million, two hundred twenty-one thousand, five hundred sixty-six".