313220209 has 2 divisors, whose sum is σ = 313220210. Its totient is φ = 313220208.

The previous prime is 313220191. The next prime is 313220231. The reversal of 313220209 is 902022313.

It is an a-pointer prime, because the next prime (313220231) can be obtained adding 313220209 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 260338225 + 52881984 = 16135^2 + 7272^2 .

It is an emirp because it is prime and its reverse (902022313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313220209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 313220209.

It is not a weakly prime, because it can be changed into another prime (313220239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156610104 + 156610105.

It is an arithmetic number, because the mean of its divisors is an integer number (156610105).

Almost surely, 2^313220209 is an apocalyptic number.

It is an amenable number.

313220209 is a deficient number, since it is larger than the sum of its proper divisors (1).

313220209 is an equidigital number, since it uses as much as digits as its factorization.

313220209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 313220209 is about 17698.0283930160. The cubic root of 313220209 is about 679.1253236371.

The spelling of 313220209 in words is "three hundred thirteen million, two hundred twenty thousand, two hundred nine".