3221651 has 4 divisors (see below), whose sum is σ = 3227112. Its totient is φ = 3216192.

The previous prime is 3221641. The next prime is 3221677. The reversal of 3221651 is 1561223.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1561223 = 223 ⋅7001.

It is a cyclic number.

It is not a de Polignac number, because 3221651 - 2¹⁰ = 3220627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3221641) 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, 1721 + ... + 3066.

It is an arithmetic number, because the mean of its divisors is an integer number (806778).

Almost surely, 2^3221651 is an apocalyptic number.

3221651 is a deficient number, since it is larger than the sum of its proper divisors (5461).

3221651 is an equidigital number, since it uses as much as digits as its factorization.

3221651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5460.

The product of its digits is 360, while the sum is 20.

The square root of 3221651 is about 1794.8958187037. The cubic root of 3221651 is about 147.6928588986.

Adding to 3221651 its reverse (1561223), we get a palindrome (4782874).

The spelling of 3221651 in words is "three million, two hundred twenty-one thousand, six hundred fifty-one".