313113221 has 2 divisors, whose sum is σ = 313113222. Its totient is φ = 313113220.

The previous prime is 313113211. The next prime is 313113247. The reversal of 313113221 is 122311313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 313113025 + 196 = 17695^2 + 14^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313113221 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 313113221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313113211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156556610 + 156556611.

It is an arithmetic number, because the mean of its divisors is an integer number (156556611).

Almost surely, 2^313113221 is an apocalyptic number.

It is an amenable number.

313113221 is a deficient number, since it is larger than the sum of its proper divisors (1).

313113221 is an equidigital number, since it uses as much as digits as its factorization.

313113221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 17.

The square root of 313113221 is about 17695.0055382868. The cubic root of 313113221 is about 679.0479908934.

Adding to 313113221 its reverse (122311313), we get a palindrome (435424534).

The spelling of 313113221 in words is "three hundred thirteen million, one hundred thirteen thousand, two hundred twenty-one".