281329 has 8 divisors (see below), whose sum is σ = 297000. Its totient is φ = 266112.

The previous prime is 281327. The next prime is 281339. The reversal of 281329 is 923182.

It can be written as a sum of positive squares in 4 ways, for example, as 31329 + 250000 = 177^2 + 500^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 281329 - 2¹ = 281327 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 281329.

It is not an unprimeable number, because it can be changed into a prime (281321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2527 + ... + 2635.

It is an arithmetic number, because the mean of its divisors is an integer number (37125).

2²⁸¹³²⁹ is an apocalyptic number.

281329 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

281329 is a deficient number, since it is larger than the sum of its proper divisors (15671).

281329 is a wasteful number, since it uses less digits than its factorization.

281329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227.

The product of its digits is 864, while the sum is 25.

The square root of 281329 is about 530.4045625746. The cubic root of 281329 is about 65.5246687571.

The spelling of 281329 in words is "two hundred eighty-one thousand, three hundred twenty-nine".