321397 has 2 divisors, whose sum is σ = 321398. Its totient is φ = 321396.

The previous prime is 321383. The next prime is 321403. The reversal of 321397 is 793123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 224676 + 96721 = 474^2 + 311^2 .

It is an emirp because it is prime and its reverse (793123) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321397 is a prime.

321397 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160698 + 160699.

It is an arithmetic number, because the mean of its divisors is an integer number (160699).

2³²¹³⁹⁷ is an apocalyptic number.

It is an amenable number.

321397 is a deficient number, since it is larger than the sum of its proper divisors (1).

321397 is an equidigital number, since it uses as much as digits as its factorization.

321397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 25.

The square root of 321397 is about 566.9188654473. The cubic root of 321397 is about 68.4984282233.

The spelling of 321397 in words is "three hundred twenty-one thousand, three hundred ninety-seven".