281623 has 2 divisors, whose sum is σ = 281624. Its totient is φ = 281622.

The previous prime is 281621. The next prime is 281627. The reversal of 281623 is 326182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 281623 - 2¹ = 281621 is a prime.

Together with 281621, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 281594 and 281603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140811 + 140812.

It is an arithmetic number, because the mean of its divisors is an integer number (140812).

2²⁸¹⁶²³ is an apocalyptic number.

281623 is a deficient number, since it is larger than the sum of its proper divisors (1).

281623 is an equidigital number, since it uses as much as digits as its factorization.

281623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 22.

The square root of 281623 is about 530.6816371423. The cubic root of 281623 is about 65.5474861060.

The spelling of 281623 in words is "two hundred eighty-one thousand, six hundred twenty-three".