321309713 has 2 divisors, whose sum is σ = 321309714. Its totient is φ = 321309712.

The previous prime is 321309697. The next prime is 321309727. The reversal of 321309713 is 317903123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 312829969 + 8479744 = 17687^2 + 2912^2 .

It is a cyclic number.

It is not a de Polignac number, because 321309713 - 2⁴ = 321309697 is a prime.

It is not a weakly prime, because it can be changed into another prime (321309733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160654856 + 160654857.

It is an arithmetic number, because the mean of its divisors is an integer number (160654857).

Almost surely, 2^321309713 is an apocalyptic number.

It is an amenable number.

321309713 is a deficient number, since it is larger than the sum of its proper divisors (1).

321309713 is an equidigital number, since it uses as much as digits as its factorization.

321309713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 29.

The square root of 321309713 is about 17925.1140303207. The cubic root of 321309713 is about 684.9222658518.

The spelling of 321309713 in words is "three hundred twenty-one million, three hundred nine thousand, seven hundred thirteen".