281963 has 4 divisors (see below), whose sum is σ = 307608. Its totient is φ = 256320.

The previous prime is 281959. The next prime is 281971. The reversal of 281963 is 369182.

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 281963 - 2² = 281959 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 281963.

It is not an unprimeable number, because it can be changed into a prime (281923) 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, 12806 + ... + 12827.

It is an arithmetic number, because the mean of its divisors is an integer number (76902).

2²⁸¹⁹⁶³ is an apocalyptic number.

281963 is a deficient number, since it is larger than the sum of its proper divisors (25645).

281963 is a wasteful number, since it uses less digits than its factorization.

281963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25644.

The product of its digits is 2592, while the sum is 29.

The square root of 281963 is about 531.0018832358. The cubic root of 281963 is about 65.5738537236.

It can be divided in two parts, 2819 and 63, that added together give a palindrome (2882).

The spelling of 281963 in words is "two hundred eighty-one thousand, nine hundred sixty-three".