311323811 has 2 divisors, whose sum is σ = 311323812. Its totient is φ = 311323810.

The previous prime is 311323769. The next prime is 311323813. The reversal of 311323811 is 118323113.

It is a strong prime.

It is an emirp because it is prime and its reverse (118323113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311323811 - 2²² = 307129507 is a prime.

Together with 311323813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (311323813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155661905 + 155661906.

It is an arithmetic number, because the mean of its divisors is an integer number (155661906).

Almost surely, 2^311323811 is an apocalyptic number.

311323811 is a deficient number, since it is larger than the sum of its proper divisors (1).

311323811 is an equidigital number, since it uses as much as digits as its factorization.

311323811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 23.

The square root of 311323811 is about 17644.3705186669. The cubic root of 311323811 is about 677.7519555980.

Adding to 311323811 its reverse (118323113), we get a palindrome (429646924).

It can be divided in two parts, 31132 and 3811, that added together give a palindrome (34943).

The spelling of 311323811 in words is "three hundred eleven million, three hundred twenty-three thousand, eight hundred eleven".