320669 has 2 divisors, whose sum is σ = 320670. Its totient is φ = 320668.

The previous prime is 320659. The next prime is 320687. The reversal of 320669 is 966023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 319225 + 1444 = 565^2 + 38^2 .

It is a cyclic number.

It is not a de Polignac number, because 320669 - 2¹⁶ = 255133 is a prime.

It is a super-2 number, since 2×320669² = 205657215122, which contains 22 as substring.

It is equal to p₂₇₆₆₅ and since 320669 and 27665 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320669.

It is not a weakly prime, because it can be changed into another prime (320609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160334 + 160335.

It is an arithmetic number, because the mean of its divisors is an integer number (160335).

2³²⁰⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

320669 is a deficient number, since it is larger than the sum of its proper divisors (1).

320669 is an equidigital number, since it uses as much as digits as its factorization.

320669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 320669 is about 566.2764342616. The cubic root of 320669 is about 68.4466702682.

It can be divided in two parts, 320 and 669, that added together give a palindrome (989).

The spelling of 320669 in words is "three hundred twenty thousand, six hundred sixty-nine".