321031313 has 2 divisors, whose sum is σ = 321031314. Its totient is φ = 321031312.

The previous prime is 321031283. The next prime is 321031339. The reversal of 321031313 is 313130123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 253987969 + 67043344 = 15937^2 + 8188^2 .

It is a cyclic number.

It is not a de Polignac number, because 321031313 - 2⁸ = 321031057 is a prime.

It is a super-2 number, since 2×321031313² = 206122207853007938, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 321031291 and 321031300.

It is not a weakly prime, because it can be changed into another prime (321031393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160515656 + 160515657.

It is an arithmetic number, because the mean of its divisors is an integer number (160515657).

Almost surely, 2^321031313 is an apocalyptic number.

It is an amenable number.

321031313 is a deficient number, since it is larger than the sum of its proper divisors (1).

321031313 is an equidigital number, since it uses as much as digits as its factorization.

321031313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 321031313 is about 17917.3467064741. The cubic root of 321031313 is about 684.7243908731.

Adding to 321031313 its reverse (313130123), we get a palindrome (634161436).

The spelling of 321031313 in words is "three hundred twenty-one million, thirty-one thousand, three hundred thirteen".