313451221 has 2 divisors, whose sum is σ = 313451222. Its totient is φ = 313451220.

The previous prime is 313451207. The next prime is 313451233. The reversal of 313451221 is 122154313.

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., 308388721 + 5062500 = 17561^2 + 2250^2 .

It is an emirp because it is prime and its reverse (122154313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 313451221 - 2¹¹ = 313449173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 313451192 and 313451201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313451821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156725610 + 156725611.

It is an arithmetic number, because the mean of its divisors is an integer number (156725611).

Almost surely, 2^313451221 is an apocalyptic number.

It is an amenable number.

313451221 is a deficient number, since it is larger than the sum of its proper divisors (1).

313451221 is an equidigital number, since it uses as much as digits as its factorization.

313451221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 22.

The square root of 313451221 is about 17704.5536797740. The cubic root of 313451221 is about 679.2922429915.

The spelling of 313451221 in words is "three hundred thirteen million, four hundred fifty-one thousand, two hundred twenty-one".