280931 has 8 divisors (see below), whose sum is σ = 326400. Its totient is φ = 236808.

The previous prime is 280927. The next prime is 280933. The reversal of 280931 is 139082.

280931 is nontrivially palindromic in base 14.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 280931 - 2² = 280927 is a prime.

It is a super-2 number, since 2×280931² = 157844453522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 280897 and 280906.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280931.

It is not an unprimeable number, because it can be changed into a prime (280933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170 + ... + 768.

It is an arithmetic number, because the mean of its divisors is an integer number (40800).

2²⁸⁰⁹³¹ is an apocalyptic number.

280931 is a deficient number, since it is larger than the sum of its proper divisors (45469).

280931 is an equidigital number, since it uses as much as digits as its factorization.

280931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 280931 is about 530.0292444762. The cubic root of 280931 is about 65.4937546247.

The spelling of 280931 in words is "two hundred eighty thousand, nine hundred thirty-one".