311223222 has 32 divisors (see below), whose sum is σ = 700155360. Its totient is φ = 103739616.

The previous prime is 311223221. The next prime is 311223223. The reversal of 311223222 is 222322113.

It is an interprime number because it is at equal distance from previous prime (311223221) and next prime (311223223).

It is a super-2 number, since 2×311223222² = 193719787824122568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 311223195 and 311223204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311223221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31203 + ... + 39950.

It is an arithmetic number, because the mean of its divisors is an integer number (21879855).

Almost surely, 2^311223222 is an apocalyptic number.

311223222 is an abundant number, since it is smaller than the sum of its proper divisors (388932138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

311223222 is an frugal number, since it uses more digits than its factorization.

311223222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71176 (or 71158 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 311223222 is about 17641.5198324861. The cubic root of 311223222 is about 677.6789536487.

Adding to 311223222 its reverse (222322113), we get a palindrome (533545335).

The spelling of 311223222 in words is "three hundred eleven million, two hundred twenty-three thousand, two hundred twenty-two".