281801 has 8 divisors (see below), whose sum is σ = 309960. Its totient is φ = 254592.

The previous prime is 281797. The next prime is 281803. The reversal of 281801 is 108182.

It can be written as a sum of positive squares in 4 ways, for example, as 78400 + 203401 = 280^2 + 451^2 .

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

It is not a de Polignac number, because 281801 - 2² = 281797 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 281801.

It is not an unprimeable number, because it can be changed into a prime (281803) 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, 485 + ... + 893.

It is an arithmetic number, because the mean of its divisors is an integer number (38745).

2²⁸¹⁸⁰¹ is an apocalyptic number.

It is an amenable number.

281801 is a deficient number, since it is larger than the sum of its proper divisors (28159).

281801 is a wasteful number, since it uses less digits than its factorization.

281801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 281801 is about 530.8493194872. The cubic root of 281801 is about 65.5612929746.

Adding to 281801 its reverse (108182), we get a palindrome (389983).

The spelling of 281801 in words is "two hundred eighty-one thousand, eight hundred one".