280361 has 4 divisors (see below), whose sum is σ = 281424. Its totient is φ = 279300.

The previous prime is 280351. The next prime is 280373. The reversal of 280361 is 163082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 280361 - 2⁶ = 280297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280321) 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, 206 + ... + 776.

It is an arithmetic number, because the mean of its divisors is an integer number (70356).

2²⁸⁰³⁶¹ is an apocalyptic number.

It is an amenable number.

280361 is a deficient number, since it is larger than the sum of its proper divisors (1063).

280361 is an equidigital number, since it uses as much as digits as its factorization.

280361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 280361 is about 529.4912652726. The cubic root of 280361 is about 65.4494297232.

The spelling of 280361 in words is "two hundred eighty thousand, three hundred sixty-one".