311220223 has 2 divisors, whose sum is σ = 311220224. Its totient is φ = 311220222.

The previous prime is 311220167. The next prime is 311220233. The reversal of 311220223 is 322022113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 311220223 - 2¹⁷ = 311089151 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 311220197 and 311220206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311220233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155610111 + 155610112.

It is an arithmetic number, because the mean of its divisors is an integer number (155610112).

Almost surely, 2^311220223 is an apocalyptic number.

311220223 is a deficient number, since it is larger than the sum of its proper divisors (1).

311220223 is an equidigital number, since it uses as much as digits as its factorization.

311220223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 311220223 is about 17641.4348339357. The cubic root of 311220223 is about 677.6767768984.

Adding to 311220223 its reverse (322022113), we get a palindrome (633242336).

The spelling of 311220223 in words is "three hundred eleven million, two hundred twenty thousand, two hundred twenty-three".