321617 has 2 divisors, whose sum is σ = 321618. Its totient is φ = 321616.

The previous prime is 321611. The next prime is 321619. The reversal of 321617 is 716123.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 271441 + 50176 = 521^2 + 224^2 .

It is an emirp because it is prime and its reverse (716123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321617 - 2⁶ = 321553 is a prime.

Together with 321619, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 321617.

It is not a weakly prime, because it can be changed into another prime (321611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160808 + 160809.

It is an arithmetic number, because the mean of its divisors is an integer number (160809).

2³²¹⁶¹⁷ is an apocalyptic number.

It is an amenable number.

321617 is a deficient number, since it is larger than the sum of its proper divisors (1).

321617 is an equidigital number, since it uses as much as digits as its factorization.

321617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252, while the sum is 20.

The square root of 321617 is about 567.1128635466. The cubic root of 321617 is about 68.5140539832.

The spelling of 321617 in words is "three hundred twenty-one thousand, six hundred seventeen".