311443321 has 4 divisors (see below), whose sum is σ = 355935232. Its totient is φ = 266951412.

The previous prime is 311443313. The next prime is 311443337. The reversal of 311443321 is 123344113.

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, and also an emirpimes, since its reverse is a distinct semiprime: 123344113 = 41 ⋅3008393.

It is not a de Polignac number, because 311443321 - 2³ = 311443313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311443292 and 311443301.

It is not an unprimeable number, because it can be changed into a prime (311443021) 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, 22245945 + ... + 22245958.

It is an arithmetic number, because the mean of its divisors is an integer number (88983808).

Almost surely, 2^311443321 is an apocalyptic number.

It is an amenable number.

311443321 is a deficient number, since it is larger than the sum of its proper divisors (44491911).

311443321 is an equidigital number, since it uses as much as digits as its factorization.

311443321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44491910.

The product of its digits is 864, while the sum is 22.

The square root of 311443321 is about 17647.7568262938. The cubic root of 311443321 is about 677.8386689290.

Adding to 311443321 its reverse (123344113), we get a palindrome (434787434).

The spelling of 311443321 in words is "three hundred eleven million, four hundred forty-three thousand, three hundred twenty-one".