283991 has 4 divisors (see below), whose sum is σ = 293184. Its totient is φ = 274800.

The previous prime is 283979. The next prime is 284003. The reversal of 283991 is 199382.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (283979) and next prime (284003).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-283991 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (283961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4550 + ... + 4611.

It is an arithmetic number, because the mean of its divisors is an integer number (73296).

2²⁸³⁹⁹¹ is an apocalyptic number.

283991 is a deficient number, since it is larger than the sum of its proper divisors (9193).

283991 is an equidigital number, since it uses as much as digits as its factorization.

283991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9192.

The product of its digits is 3888, while the sum is 32.

The square root of 283991 is about 532.9080596125. The cubic root of 283991 is about 65.7306901615.

The spelling of 283991 in words is "two hundred eighty-three thousand, nine hundred ninety-one".