311213213 has 2 divisors, whose sum is σ = 311213214. Its totient is φ = 311213212.

The previous prime is 311213209. The next prime is 311213251. The reversal of 311213213 is 312312113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249071524 + 62141689 = 15782^2 + 7883^2 .

It is a cyclic number.

It is not a de Polignac number, because 311213213 - 2² = 311213209 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 311213191 and 311213200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311213113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155606606 + 155606607.

It is an arithmetic number, because the mean of its divisors is an integer number (155606607).

Almost surely, 2^311213213 is an apocalyptic number.

It is an amenable number.

311213213 is a deficient number, since it is larger than the sum of its proper divisors (1).

311213213 is an equidigital number, since it uses as much as digits as its factorization.

311213213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 17.

The square root of 311213213 is about 17641.2361528324. The cubic root of 311213213 is about 677.6716888080.

Adding to 311213213 its reverse (312312113), we get a palindrome (623525326).

The spelling of 311213213 in words is "three hundred eleven million, two hundred thirteen thousand, two hundred thirteen".