311949217 has 2 divisors, whose sum is σ = 311949218. Its totient is φ = 311949216.

The previous prime is 311949179. The next prime is 311949227. The reversal of 311949217 is 712949113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 274200481 + 37748736 = 16559^2 + 6144^2 .

It is a cyclic number.

It is not a de Polignac number, because 311949217 - 2⁷ = 311949089 is a prime.

It is not a weakly prime, because it can be changed into another prime (311949227) 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, 155974608 + 155974609.

It is an arithmetic number, because the mean of its divisors is an integer number (155974609).

Almost surely, 2^311949217 is an apocalyptic number.

It is an amenable number.

311949217 is a deficient number, since it is larger than the sum of its proper divisors (1).

311949217 is an equidigital number, since it uses as much as digits as its factorization.

311949217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 37.

The square root of 311949217 is about 17662.0841635408. The cubic root of 311949217 is about 678.2054883389.

The spelling of 311949217 in words is "three hundred eleven million, nine hundred forty-nine thousand, two hundred seventeen".