281011 has 4 divisors (see below), whose sum is σ = 283024. Its totient is φ = 279000.

The previous prime is 280997. The next prime is 281023. The reversal of 281011 is 110182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 281011 - 2⁵ = 280979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 280982 and 281000.

It is not an unprimeable number, because it can be changed into a prime (281081) 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, 780 + ... + 1081.

It is an arithmetic number, because the mean of its divisors is an integer number (70756).

2²⁸¹⁰¹¹ is an apocalyptic number.

281011 is a deficient number, since it is larger than the sum of its proper divisors (2013).

281011 is a wasteful number, since it uses less digits than its factorization.

281011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 281011 is about 530.1047066382. The cubic root of 281011 is about 65.4999708642.

Adding to 281011 its reverse (110182), we get a palindrome (391193).

The spelling of 281011 in words is "two hundred eighty-one thousand, eleven".