311223223 has 2 divisors, whose sum is σ = 311223224. Its totient is φ = 311223222.

The previous prime is 311223221. The next prime is 311223247. The reversal of 311223223 is 322322113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 311223223 - 2¹ = 311223221 is a prime.

Together with 311223221, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 311223223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311223221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155611611 + 155611612.

It is an arithmetic number, because the mean of its divisors is an integer number (155611612).

Almost surely, 2^311223223 is an apocalyptic number.

311223223 is a deficient number, since it is larger than the sum of its proper divisors (1).

311223223 is an equidigital number, since it uses as much as digits as its factorization.

311223223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 19.

The square root of 311223223 is about 17641.5198608283. The cubic root of 311223223 is about 677.6789543745.

Adding to 311223223 its reverse (322322113), we get a palindrome (633545336).

It can be divided in two parts, 3112 and 23223, that added together give a triangular number (26335 = T₂₂₉).

The spelling of 311223223 in words is "three hundred eleven million, two hundred twenty-three thousand, two hundred twenty-three".