313241221 has 2 divisors, whose sum is σ = 313241222. Its totient is φ = 313241220.

The previous prime is 313241177. The next prime is 313241233. The reversal of 313241221 is 122142313.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 311522500 + 1718721 = 17650^2 + 1311^2 .

It is a cyclic number.

It is not a de Polignac number, because 313241221 - 2¹⁵ = 313208453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313241251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156620610 + 156620611.

It is an arithmetic number, because the mean of its divisors is an integer number (156620611).

Almost surely, 2^313241221 is an apocalyptic number.

It is an amenable number.

313241221 is a deficient number, since it is larger than the sum of its proper divisors (1).

313241221 is an equidigital number, since it uses as much as digits as its factorization.

313241221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 19.

The square root of 313241221 is about 17698.6220085068. The cubic root of 313241221 is about 679.1405093986.

Adding to 313241221 its reverse (122142313), we get a palindrome (435383534).

The spelling of 313241221 in words is "three hundred thirteen million, two hundred forty-one thousand, two hundred twenty-one".