313203221 has 2 divisors, whose sum is σ = 313203222. Its totient is φ = 313203220.

The previous prime is 313203217. The next prime is 313203263. The reversal of 313203221 is 122302313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 312900721 + 302500 = 17689^2 + 550^2 .

It is a cyclic number.

It is not a de Polignac number, because 313203221 - 2² = 313203217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 313203221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313203521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156601610 + 156601611.

It is an arithmetic number, because the mean of its divisors is an integer number (156601611).

Almost surely, 2^313203221 is an apocalyptic number.

It is an amenable number.

313203221 is a deficient number, since it is larger than the sum of its proper divisors (1).

313203221 is an equidigital number, since it uses as much as digits as its factorization.

313203221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 313203221 is about 17697.5484460419. The cubic root of 313203221 is about 679.1130455983.

Adding to 313203221 its reverse (122302313), we get a palindrome (435505534).

The spelling of 313203221 in words is "three hundred thirteen million, two hundred three thousand, two hundred twenty-one".