3161244221 has 4 divisors (see below), whose sum is σ = 3246683292. Its totient is φ = 3075805152.

The previous prime is 3161244199. The next prime is 3161244227. The reversal of 3161244221 is 1224421613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1224421613 = 683 ⋅1792711.

It can be written as a sum of positive squares in 2 ways, for example, as 1783795225 + 1377448996 = 42235^2 + 37114^2 .

It is a cyclic number.

It is not a de Polignac number, because 3161244221 - 2¹⁴ = 3161227837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3161244227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42719480 + ... + 42719553.

It is an arithmetic number, because the mean of its divisors is an integer number (811670823).

Almost surely, 2^3161244221 is an apocalyptic number.

It is an amenable number.

3161244221 is a deficient number, since it is larger than the sum of its proper divisors (85439071).

3161244221 is an equidigital number, since it uses as much as digits as its factorization.

3161244221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85439070.

The product of its digits is 2304, while the sum is 26.

The square root of 3161244221 is about 56224.9430502157. The cubic root of 3161244221 is about 1467.6393568776.

Adding to 3161244221 its reverse (1224421613), we get a palindrome (4385665834).

The spelling of 3161244221 in words is "three billion, one hundred sixty-one million, two hundred forty-four thousand, two hundred twenty-one".