281923 has 2 divisors, whose sum is σ = 281924. Its totient is φ = 281922.

The previous prime is 281921. The next prime is 281927. The reversal of 281923 is 329182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 281923 - 2¹ = 281921 is a prime.

Together with 281921, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (281921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140961 + 140962.

It is an arithmetic number, because the mean of its divisors is an integer number (140962).

2²⁸¹⁹²³ is an apocalyptic number.

281923 is a deficient number, since it is larger than the sum of its proper divisors (1).

281923 is an equidigital number, since it uses as much as digits as its factorization.

281923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 25.

The square root of 281923 is about 530.9642172501. The cubic root of 281923 is about 65.5707527515.

The spelling of 281923 in words is "two hundred eighty-one thousand, nine hundred twenty-three".