284491 has 4 divisors (see below), whose sum is σ = 290592. Its totient is φ = 278392.

The previous prime is 284489. The next prime is 284507. The reversal of 284491 is 194482.

284491 = T₄₃₄ + T₄₃₅ + T₄₃₆.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194482 = 2 ⋅97241.

It is a cyclic number.

It is not a de Polignac number, because 284491 - 2¹ = 284489 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (284191) 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, 2980 + ... + 3073.

It is an arithmetic number, because the mean of its divisors is an integer number (72648).

2²⁸⁴⁴⁹¹ is an apocalyptic number.

284491 is the 436-th centered triangular number.

284491 is a deficient number, since it is larger than the sum of its proper divisors (6101).

284491 is an equidigital number, since it uses as much as digits as its factorization.

284491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6100.

The product of its digits is 2304, while the sum is 28.

The square root of 284491 is about 533.3769773809. The cubic root of 284491 is about 65.7692431158.

Subtracting from 284491 its reverse (194482), we obtain a palindrome (90009).

The spelling of 284491 in words is "two hundred eighty-four thousand, four hundred ninety-one".