281321 has 2 divisors, whose sum is σ = 281322. Its totient is φ = 281320.

The previous prime is 281317. The next prime is 281327. The reversal of 281321 is 123182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225625 + 55696 = 475^2 + 236^2 .

It is a cyclic number.

It is not a de Polignac number, because 281321 - 2² = 281317 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 281321.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 281321.

It is not a weakly prime, because it can be changed into another prime (281327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140660 + 140661.

It is an arithmetic number, because the mean of its divisors is an integer number (140661).

2²⁸¹³²¹ is an apocalyptic number.

It is an amenable number.

281321 is a deficient number, since it is larger than the sum of its proper divisors (1).

281321 is an equidigital number, since it uses as much as digits as its factorization.

281321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 17.

The square root of 281321 is about 530.3970211078. The cubic root of 281321 is about 65.5240476547.

The spelling of 281321 in words is "two hundred eighty-one thousand, three hundred twenty-one".