3161221 has 8 divisors (see below), whose sum is σ = 3657024. Its totient is φ = 2676480.

The previous prime is 3161209. The next prime is 3161227. The reversal of 3161221 is 1221613.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3161221 - 2⁹ = 3160709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3161195 and 3161204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3161227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2140 + ... + 3301.

It is an arithmetic number, because the mean of its divisors is an integer number (457128).

Almost surely, 2^3161221 is an apocalyptic number.

It is an amenable number.

3161221 is a deficient number, since it is larger than the sum of its proper divisors (495803).

3161221 is an equidigital number, since it uses as much as digits as its factorization.

3161221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5531.

The product of its digits is 72, while the sum is 16.

The square root of 3161221 is about 1777.9822833763. The cubic root of 3161221 is about 146.7635763341.

Adding to 3161221 its reverse (1221613), we get a palindrome (4382834).

The spelling of 3161221 in words is "three million, one hundred sixty-one thousand, two hundred twenty-one".