280331 has 4 divisors (see below), whose sum is σ = 281952. Its totient is φ = 278712.

The previous prime is 280327. The next prime is 280337. The reversal of 280331 is 133082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133082 = 2 ⋅66541.

It is a cyclic number.

It is not a de Polignac number, because 280331 - 2² = 280327 is a prime.

It is a super-2 number, since 2×280331² = 157170939122, 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 280331.

It is not an unprimeable number, because it can be changed into a prime (280337) 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, 515 + ... + 908.

It is an arithmetic number, because the mean of its divisors is an integer number (70488).

2²⁸⁰³³¹ is an apocalyptic number.

280331 is a deficient number, since it is larger than the sum of its proper divisors (1621).

280331 is a wasteful number, since it uses less digits than its factorization.

280331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 280331 is about 529.4629354355. The cubic root of 280331 is about 65.4470951701.

The spelling of 280331 in words is "two hundred eighty thousand, three hundred thirty-one".