281023 has 2 divisors, whose sum is σ = 281024. Its totient is φ = 281022.

The previous prime is 280997. The next prime is 281033. The reversal of 281023 is 320182.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-281023 is a prime.

281023 is a lucky number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 280988 and 281006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140511 + 140512.

It is an arithmetic number, because the mean of its divisors is an integer number (140512).

2²⁸¹⁰²³ is an apocalyptic number.

281023 is a deficient number, since it is larger than the sum of its proper divisors (1).

281023 is an equidigital number, since it uses as much as digits as its factorization.

281023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 281023 is about 530.1160250360. The cubic root of 281023 is about 65.5009031983.

The spelling of 281023 in words is "two hundred eighty-one thousand, twenty-three".