321456313 has 2 divisors, whose sum is σ = 321456314. Its totient is φ = 321456312.

The previous prime is 321456287. The next prime is 321456403. The reversal of 321456313 is 313654123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 320660649 + 795664 = 17907^2 + 892^2 .

It is an emirp because it is prime and its reverse (313654123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321456313 - 2⁹ = 321455801 is a prime.

It is a super-2 number, since 2×321456313² = 206668322335107938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (321450313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160728156 + 160728157.

It is an arithmetic number, because the mean of its divisors is an integer number (160728157).

Almost surely, 2^321456313 is an apocalyptic number.

It is an amenable number.

321456313 is a deficient number, since it is larger than the sum of its proper divisors (1).

321456313 is an equidigital number, since it uses as much as digits as its factorization.

321456313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 28.

The square root of 321456313 is about 17929.2027987861. The cubic root of 321456313 is about 685.0264170109.

The spelling of 321456313 in words is "three hundred twenty-one million, four hundred fifty-six thousand, three hundred thirteen".