311323031213 has 2 divisors, whose sum is σ = 311323031214. Its totient is φ = 311323031212.

The previous prime is 311323031197. The next prime is 311323031251. The reversal of 311323031213 is 312130323113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198428375209 + 112894656004 = 445453^2 + 335998^2 .

It is a cyclic number.

It is not a de Polignac number, because 311323031213 - 2⁴ = 311323031197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311323037213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155661515606 + 155661515607.

It is an arithmetic number, because the mean of its divisors is an integer number (155661515607).

Almost surely, 2^311323031213 is an apocalyptic number.

It is an amenable number.

311323031213 is a deficient number, since it is larger than the sum of its proper divisors (1).

311323031213 is an equidigital number, since it uses as much as digits as its factorization.

311323031213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 311323031213 its reverse (312130323113), we get a palindrome (623453354326).

The spelling of 311323031213 in words is "three hundred eleven billion, three hundred twenty-three million, thirty-one thousand, two hundred thirteen".