281530 has 16 divisors (see below), whose sum is σ = 518400. Its totient is φ = 110032.

The previous prime is 281527. The next prime is 281531. The reversal of 281530 is 35182.

It is a happy number.

281530 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 281498 and 281507.

It is not an unprimeable number, because it can be changed into a prime (281531) 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, 171 + ... + 769.

It is an arithmetic number, because the mean of its divisors is an integer number (32400).

2²⁸¹⁵³⁰ is an apocalyptic number.

281530 is a deficient number, since it is larger than the sum of its proper divisors (236870).

281530 is a wasteful number, since it uses less digits than its factorization.

281530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 281530 is about 530.5940067509. The cubic root of 281530 is about 65.5402700911.

The spelling of 281530 in words is "two hundred eighty-one thousand, five hundred thirty".