311203313 has 2 divisors, whose sum is σ = 311203314. Its totient is φ = 311203312.

The previous prime is 311203297. The next prime is 311203339. The reversal of 311203313 is 313302113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189145009 + 122058304 = 13753^2 + 11048^2 .

It is a cyclic number.

It is not a de Polignac number, because 311203313 - 2⁴ = 311203297 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 311203291 and 311203300.

It is not a weakly prime, because it can be changed into another prime (311203813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155601656 + 155601657.

It is an arithmetic number, because the mean of its divisors is an integer number (155601657).

Almost surely, 2^311203313 is an apocalyptic number.

It is an amenable number.

311203313 is a deficient number, since it is larger than the sum of its proper divisors (1).

311203313 is an equidigital number, since it uses as much as digits as its factorization.

311203313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 311203313 is about 17640.9555580190. The cubic root of 311203313 is about 677.6645029297.

Adding to 311203313 its reverse (313302113), we get a palindrome (624505426).

The spelling of 311203313 in words is "three hundred eleven million, two hundred three thousand, three hundred thirteen".