311351213 has 2 divisors, whose sum is σ = 311351214. Its totient is φ = 311351212.

The previous prime is 311351191. The next prime is 311351231. The reversal of 311351213 is 312153113.

Together with next prime (311351231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183819364 + 127531849 = 13558^2 + 11293^2 .

It is an emirp because it is prime and its reverse (312153113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311351213 - 2²² = 307156909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311351113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155675606 + 155675607.

It is an arithmetic number, because the mean of its divisors is an integer number (155675607).

Almost surely, 2^311351213 is an apocalyptic number.

It is an amenable number.

311351213 is a deficient number, since it is larger than the sum of its proper divisors (1).

311351213 is an equidigital number, since it uses as much as digits as its factorization.

311351213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270, while the sum is 20.

The square root of 311351213 is about 17645.1470098721. The cubic root of 311351213 is about 677.7718397332.

The spelling of 311351213 in words is "three hundred eleven million, three hundred fifty-one thousand, two hundred thirteen".