321309943 has 2 divisors, whose sum is σ = 321309944. Its totient is φ = 321309942.

The previous prime is 321309917. The next prime is 321309949. The reversal of 321309943 is 349903123.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321309943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 321309899 and 321309908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321309949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160654971 + 160654972.

It is an arithmetic number, because the mean of its divisors is an integer number (160654972).

Almost surely, 2^321309943 is an apocalyptic number.

321309943 is a deficient number, since it is larger than the sum of its proper divisors (1).

321309943 is an equidigital number, since it uses as much as digits as its factorization.

321309943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 34.

The square root of 321309943 is about 17925.1204458994. The cubic root of 321309943 is about 684.9224292788.

The spelling of 321309943 in words is "three hundred twenty-one million, three hundred nine thousand, nine hundred forty-three".