281591 has 4 divisors (see below), whose sum is σ = 284592. Its totient is φ = 278592.

The previous prime is 281581. The next prime is 281609. The reversal of 281591 is 195182.

It is a happy number.

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 281591 - 2⁶ = 281527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 281591.

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 281591.

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 3 ways as a sum of consecutive naturals, for example, 1355 + ... + 1548.

It is an arithmetic number, because the mean of its divisors is an integer number (71148).

2²⁸¹⁵⁹¹ is an apocalyptic number.

281591 is a deficient number, since it is larger than the sum of its proper divisors (3001).

281591 is an equidigital number, since it uses as much as digits as its factorization.

281591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3000.

The product of its digits is 720, while the sum is 26.

The square root of 281591 is about 530.6514863825. The cubic root of 281591 is about 65.5450033554.

The spelling of 281591 in words is "two hundred eighty-one thousand, five hundred ninety-one".