281663 has 2 divisors, whose sum is σ = 281664. Its totient is φ = 281662.

The previous prime is 281653. The next prime is 281669. The reversal of 281663 is 366182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 281663 - 2⁴ = 281647 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a plaindrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140831 + 140832.

It is an arithmetic number, because the mean of its divisors is an integer number (140832).

2²⁸¹⁶⁶³ is an apocalyptic number.

281663 is a deficient number, since it is larger than the sum of its proper divisors (1).

281663 is an equidigital number, since it uses as much as digits as its factorization.

281663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 281663 is about 530.7193231832. The cubic root of 281663 is about 65.5505892798.

It can be divided in two parts, 28 and 1663, that multiplied together give a palindrome (46564).

The spelling of 281663 in words is "two hundred eighty-one thousand, six hundred sixty-three".