281091 has 8 divisors (see below), whose sum is σ = 383680. Its totient is φ = 182952.

The previous prime is 281081. The next prime is 281117. The reversal of 281091 is 190182.

281091 = 9² + 10² + ... + 94².

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

It is not a de Polignac number, because 281091 - 2⁷ = 280963 is a prime.

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 281091.

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 7 ways as a sum of consecutive naturals, for example, 961 + ... + 1218.

It is an arithmetic number, because the mean of its divisors is an integer number (47960).

2²⁸¹⁰⁹¹ is an apocalyptic number.

281091 is a deficient number, since it is larger than the sum of its proper divisors (102589).

281091 is a wasteful number, since it uses less digits than its factorization.

281091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 281091 is about 530.1801580595. The cubic root of 281091 is about 65.5061859239.

Subtracting from 281091 its reverse (190182), we obtain a palindrome (90909).

The spelling of 281091 in words is "two hundred eighty-one thousand, ninety-one".