311228917 has 2 divisors, whose sum is σ = 311228918. Its totient is φ = 311228916.

The previous prime is 311228891. The next prime is 311228989. The reversal of 311228917 is 719822113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 308318481 + 2910436 = 17559^2 + 1706^2 .

It is a cyclic number.

It is not a de Polignac number, because 311228917 - 2⁷ = 311228789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311228017) 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, 155614458 + 155614459.

It is an arithmetic number, because the mean of its divisors is an integer number (155614459).

Almost surely, 2^311228917 is an apocalyptic number.

It is an amenable number.

311228917 is a deficient number, since it is larger than the sum of its proper divisors (1).

311228917 is an equidigital number, since it uses as much as digits as its factorization.

311228917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 34.

The square root of 311228917 is about 17641.6812407435. The cubic root of 311228917 is about 677.6830871857.

The spelling of 311228917 in words is "three hundred eleven million, two hundred twenty-eight thousand, nine hundred seventeen".