281633 has 4 divisors (see below), whose sum is σ = 307248. Its totient is φ = 256020.

The previous prime is 281627. The next prime is 281641. The reversal of 281633 is 336182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 281633 - 2¹⁴ = 265249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 281599 and 281608.

It is not an unprimeable number, because it can be changed into a prime (281623) 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, 12791 + ... + 12812.

It is an arithmetic number, because the mean of its divisors is an integer number (76812).

2²⁸¹⁶³³ is an apocalyptic number.

It is an amenable number.

281633 is a deficient number, since it is larger than the sum of its proper divisors (25615).

281633 is a wasteful number, since it uses less digits than its factorization.

281633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25614.

The product of its digits is 864, while the sum is 23.

The square root of 281633 is about 530.6910589034. The cubic root of 281633 is about 65.5482619270.

It can be divided in two parts, 28 and 1633, that added together give a palindrome (1661).

The spelling of 281633 in words is "two hundred eighty-one thousand, six hundred thirty-three".