311321223 has 6 divisors (see below), whose sum is σ = 449686224. Its totient is φ = 207547476.

The previous prime is 311321207. The next prime is 311321237. The reversal of 311321223 is 322123113.

It is not a de Polignac number, because 311321223 - 2⁴ = 311321207 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 311321196 and 311321205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311321243) 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 5 ways as a sum of consecutive naturals, for example, 17295615 + ... + 17295632.

It is an arithmetic number, because the mean of its divisors is an integer number (74947704).

Almost surely, 2^311321223 is an apocalyptic number.

311321223 is a deficient number, since it is larger than the sum of its proper divisors (138365001).

311321223 is a wasteful number, since it uses less digits than its factorization.

311321223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34591253 (or 34591250 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 311321223 is about 17644.2971806757. The cubic root of 311321223 is about 677.7500775674.

Adding to 311321223 its reverse (322123113), we get a palindrome (633444336).

It can be divided in two parts, 3113 and 21223, that added together give a square (24336 = 156²).

The spelling of 311321223 in words is "three hundred eleven million, three hundred twenty-one thousand, two hundred twenty-three".