311323223 has 2 divisors, whose sum is σ = 311323224. Its totient is φ = 311323222.

The previous prime is 311323171. The next prime is 311323267. The reversal of 311323223 is 322323113.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311323223 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 311323195 and 311323204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311323273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155661611 + 155661612.

It is an arithmetic number, because the mean of its divisors is an integer number (155661612).

Almost surely, 2^311323223 is an apocalyptic number.

311323223 is a deficient number, since it is larger than the sum of its proper divisors (1).

311323223 is an equidigital number, since it uses as much as digits as its factorization.

311323223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 20.

The square root of 311323223 is about 17644.3538561207. The cubic root of 311323223 is about 677.7515289057.

Adding to 311323223 its reverse (322323113), we get a palindrome (633646336).

The spelling of 311323223 in words is "three hundred eleven million, three hundred twenty-three thousand, two hundred twenty-three".