1304313221 has 2 divisors, whose sum is σ = 1304313222. Its totient is φ = 1304313220.

The previous prime is 1304313203. The next prime is 1304313247. The reversal of 1304313221 is 1223134031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1088076196 + 216237025 = 32986^2 + 14705^2 .

It is a cyclic number.

It is not a de Polignac number, because 1304313221 - 2²⁶ = 1237204357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1304313193 and 1304313202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1304310221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652156610 + 652156611.

It is an arithmetic number, because the mean of its divisors is an integer number (652156611).

Almost surely, 2^1304313221 is an apocalyptic number.

It is an amenable number.

1304313221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1304313221 is an equidigital number, since it uses as much as digits as its factorization.

1304313221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1304313221 is about 36115.2768368180. The cubic root of 1304313221 is about 1092.5985810325.

Adding to 1304313221 its reverse (1223134031), we get a palindrome (2527447252).

The spelling of 1304313221 in words is "one billion, three hundred four million, three hundred thirteen thousand, two hundred twenty-one".