283721 has 2 divisors, whose sum is σ = 283722. Its totient is φ = 283720.

The previous prime is 283697. The next prime is 283741. The reversal of 283721 is 127382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265225 + 18496 = 515^2 + 136^2 .

It is a cyclic number.

It is not a de Polignac number, because 283721 - 2¹⁰ = 282697 is a prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 283721.

It is not a weakly prime, because it can be changed into another prime (283741) 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 as a sum of consecutive naturals, namely, 141860 + 141861.

It is an arithmetic number, because the mean of its divisors is an integer number (141861).

2²⁸³⁷²¹ is an apocalyptic number.

It is an amenable number.

283721 is a deficient number, since it is larger than the sum of its proper divisors (1).

283721 is an equidigital number, since it uses as much as digits as its factorization.

283721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 23.

The square root of 283721 is about 532.6546723723. The cubic root of 283721 is about 65.7098527480.

The spelling of 283721 in words is "two hundred eighty-three thousand, seven hundred twenty-one".