321705313 has 2 divisors, whose sum is σ = 321705314. Its totient is φ = 321705312.

The previous prime is 321705287. The next prime is 321705337. The reversal of 321705313 is 313507123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241118784 + 80586529 = 15528^2 + 8977^2 .

It is a cyclic number.

It is not a de Polignac number, because 321705313 - 2²⁵ = 288150881 is a prime.

It is not a weakly prime, because it can be changed into another prime (321745313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160852656 + 160852657.

It is an arithmetic number, because the mean of its divisors is an integer number (160852657).

Almost surely, 2^321705313 is an apocalyptic number.

It is an amenable number.

321705313 is a deficient number, since it is larger than the sum of its proper divisors (1).

321705313 is an equidigital number, since it uses as much as digits as its factorization.

321705313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890, while the sum is 25.

The square root of 321705313 is about 17936.1454331749. The cubic root of 321705313 is about 685.2032451400.

The spelling of 321705313 in words is "three hundred twenty-one million, seven hundred five thousand, three hundred thirteen".