311211223 has 2 divisors, whose sum is σ = 311211224. Its totient is φ = 311211222.

The previous prime is 311211217. The next prime is 311211227. The reversal of 311211223 is 322112113.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311211223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 311211197 and 311211206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311211227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155605611 + 155605612.

It is an arithmetic number, because the mean of its divisors is an integer number (155605612).

Almost surely, 2^311211223 is an apocalyptic number.

311211223 is a deficient number, since it is larger than the sum of its proper divisors (1).

311211223 is an equidigital number, since it uses as much as digits as its factorization.

311211223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 16.

The square root of 311211223 is about 17641.1797507990. The cubic root of 311211223 is about 677.6702443862.

Adding to 311211223 its reverse (322112113), we get a palindrome (633323336).

The spelling of 311211223 in words is "three hundred eleven million, two hundred eleven thousand, two hundred twenty-three".