280501 has 4 divisors (see below), whose sum is σ = 302092. Its totient is φ = 258912.

The previous prime is 280499. The next prime is 280507. The reversal of 280501 is 105082.

280501 = 374² + 375².

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 105082 = 2 ⋅52541.

It can be written as a sum of positive squares in 2 ways, for example, as 139876 + 140625 = 374^2 + 375^2 .

It is a cyclic number.

It is not a de Polignac number, because 280501 - 2¹ = 280499 is a prime.

It is a super-2 number, since 2×280501² = 157361622002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280507) 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, 10776 + ... + 10801.

It is an arithmetic number, because the mean of its divisors is an integer number (75523).

2²⁸⁰⁵⁰¹ is an apocalyptic number.

280501 is the 375-th centered square number.

It is an amenable number.

280501 is a deficient number, since it is larger than the sum of its proper divisors (21591).

280501 is a wasteful number, since it uses less digits than its factorization.

280501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21590.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 280501 is about 529.6234511424. The cubic root of 280501 is about 65.4603221029.

Adding to 280501 its reverse (105082), we get a palindrome (385583).

The spelling of 280501 in words is "two hundred eighty thousand, five hundred one".