320129 has 4 divisors (see below), whose sum is σ = 323076. Its totient is φ = 317184.

The previous prime is 320119. The next prime is 320141. The reversal of 320129 is 921023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 921023 = 571 ⋅1613.

It can be written as a sum of positive squares in 2 ways, for example, as 49729 + 270400 = 223^2 + 520^2 .

It is a cyclic number.

It is not a de Polignac number, because 320129 - 2⁴ = 320113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320129.

It is not an unprimeable number, because it can be changed into a prime (320119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1304 + ... + 1529.

It is an arithmetic number, because the mean of its divisors is an integer number (80769).

2³²⁰¹²⁹ is an apocalyptic number.

It is an amenable number.

320129 is a deficient number, since it is larger than the sum of its proper divisors (2947).

320129 is a wasteful number, since it uses less digits than its factorization.

320129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2946.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 320129 is about 565.7994344288. The cubic root of 320129 is about 68.4082277530.

It can be divided in two parts, 3201 and 29, that multiplied together give a palindrome (92829).

The spelling of 320129 in words is "three hundred twenty thousand, one hundred twenty-nine".