280631 has 4 divisors (see below), whose sum is σ = 302232. Its totient is φ = 259032.

The previous prime is 280627. The next prime is 280639. The reversal of 280631 is 136082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136082 = 2 ⋅68041.

It is a cyclic number.

It is not a de Polignac number, because 280631 - 2² = 280627 is a prime.

It is a super-2 number, since 2×280631² = 157507516322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280631.

It is not an unprimeable number, because it can be changed into a prime (280639) 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, 10781 + ... + 10806.

It is an arithmetic number, because the mean of its divisors is an integer number (75558).

2²⁸⁰⁶³¹ is an apocalyptic number.

280631 is a deficient number, since it is larger than the sum of its proper divisors (21601).

280631 is a wasteful number, since it uses less digits than its factorization.

280631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21600.

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

The square root of 280631 is about 529.7461656303. The cubic root of 280631 is about 65.4704332107.

The spelling of 280631 in words is "two hundred eighty thousand, six hundred thirty-one".