280831 has 4 divisors (see below), whose sum is σ = 284752. Its totient is φ = 276912.

The previous prime is 280817. The next prime is 280837. The reversal of 280831 is 138082.

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

It is a cyclic number.

It is not a de Polignac number, because 280831 - 2⁷ = 280703 is a prime.

It is a super-2 number, since 2×280831² = 157732101122, which contains 22 as substring.

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 (280837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1851 + ... + 1996.

It is an arithmetic number, because the mean of its divisors is an integer number (71188).

2²⁸⁰⁸³¹ is an apocalyptic number.

280831 is a deficient number, since it is larger than the sum of its proper divisors (3921).

280831 is an equidigital number, since it uses as much as digits as its factorization.

280831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3920.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 280831 is about 529.9349016625. The cubic root of 280831 is about 65.4859826656.

It can be divided in two parts, 280 and 831, that added together give a palindrome (1111).

The spelling of 280831 in words is "two hundred eighty thousand, eight hundred thirty-one".