311332243 has 2 divisors, whose sum is σ = 311332244. Its totient is φ = 311332242.

The previous prime is 311332223. The next prime is 311332297. The reversal of 311332243 is 342233113.

It is a weak prime.

It is an emirp because it is prime and its reverse (342233113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311332243 is a prime.

It is a super-2 number, since 2×311332243² = 193855531062822098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (311332213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155666121 + 155666122.

It is an arithmetic number, because the mean of its divisors is an integer number (155666122).

Almost surely, 2^311332243 is an apocalyptic number.

311332243 is a deficient number, since it is larger than the sum of its proper divisors (1).

311332243 is an equidigital number, since it uses as much as digits as its factorization.

311332243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 22.

The square root of 311332243 is about 17644.6094601156. The cubic root of 311332243 is about 677.7580743643.

Adding to 311332243 its reverse (342233113), we get a palindrome (653565356).

The spelling of 311332243 in words is "three hundred eleven million, three hundred thirty-two thousand, two hundred forty-three".