280481 has 4 divisors (see below), whose sum is σ = 287364. Its totient is φ = 273600.

The previous prime is 280463. The next prime is 280487. The reversal of 280481 is 184082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 184082 = 2 ⋅92041.

It can be written as a sum of positive squares in 2 ways, for example, as 99856 + 180625 = 316^2 + 425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280481 is a prime.

It is a super-2 number, since 2×280481² = 157339182722, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280481.

It is not an unprimeable number, because it can be changed into a prime (280487) 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, 3380 + ... + 3461.

It is an arithmetic number, because the mean of its divisors is an integer number (71841).

2²⁸⁰⁴⁸¹ is an apocalyptic number.

It is an amenable number.

280481 is a deficient number, since it is larger than the sum of its proper divisors (6883).

280481 is an equidigital number, since it uses as much as digits as its factorization.

280481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6882.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 280481 is about 529.6045694667. The cubic root of 280481 is about 65.4587662706.

The spelling of 280481 in words is "two hundred eighty thousand, four hundred eighty-one".