311444221 has 4 divisors (see below), whose sum is σ = 339757344. Its totient is φ = 283131100.

The previous prime is 311444201. The next prime is 311444249. The reversal of 311444221 is 122444113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 311444221 - 2⁹ = 311443709 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311444192 and 311444201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311444201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14156545 + ... + 14156566.

It is an arithmetic number, because the mean of its divisors is an integer number (84939336).

Almost surely, 2^311444221 is an apocalyptic number.

It is an amenable number.

311444221 is a deficient number, since it is larger than the sum of its proper divisors (28313123).

311444221 is a wasteful number, since it uses less digits than its factorization.

311444221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28313122.

The product of its digits is 768, while the sum is 22.

The square root of 311444221 is about 17647.7823252668. The cubic root of 311444221 is about 677.8393218613.

Adding to 311444221 its reverse (122444113), we get a palindrome (433888334).

The spelling of 311444221 in words is "three hundred eleven million, four hundred forty-four thousand, two hundred twenty-one".