321247 has 2 divisors, whose sum is σ = 321248. Its totient is φ = 321246.

The previous prime is 321239. The next prime is 321289. The reversal of 321247 is 742123.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 321247 - 2³ = 321239 is a prime.

It is a d-powerful number, because it can be written as 3¹⁰ + 2¹⁷ + 2¹⁷ + 1 + 4 + 7² .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160623 + 160624.

It is an arithmetic number, because the mean of its divisors is an integer number (160624).

2³²¹²⁴⁷ is an apocalyptic number.

321247 is a deficient number, since it is larger than the sum of its proper divisors (1).

321247 is an equidigital number, since it uses as much as digits as its factorization.

321247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 336, while the sum is 19.

The square root of 321247 is about 566.7865559450. The cubic root of 321247 is about 68.4877702073.

It can be divided in two parts, 32124 and 7, that added together give a triangular number (32131 = T₂₅₃).

The spelling of 321247 in words is "three hundred twenty-one thousand, two hundred forty-seven", and thus it is an iban number.