281391 has 8 divisors (see below), whose sum is σ = 409344. Its totient is φ = 170520.

The previous prime is 281381. The next prime is 281419. The reversal of 281391 is 193182.

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

It is not a de Polignac number, because 281391 - 2⁶ = 281327 is a prime.

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 281391.

It is not an unprimeable number, because it can be changed into a prime (281321) 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, 4231 + ... + 4296.

It is an arithmetic number, because the mean of its divisors is an integer number (51168).

2²⁸¹³⁹¹ is an apocalyptic number.

281391 is a deficient number, since it is larger than the sum of its proper divisors (127953).

281391 is a wasteful number, since it uses less digits than its factorization.

281391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8541.

The product of its digits is 432, while the sum is 24.

The square root of 281391 is about 530.4630053076. The cubic root of 281391 is about 65.5294819012.

Subtracting from 281391 its reverse (193182), we obtain a square (88209 = 297²).

The spelling of 281391 in words is "two hundred eighty-one thousand, three hundred ninety-one".