281669 has 2 divisors, whose sum is σ = 281670. Its totient is φ = 281668.

The previous prime is 281663. The next prime is 281683. The reversal of 281669 is 966182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168100 + 113569 = 410^2 + 337^2 .

It is a cyclic number.

It is not a de Polignac number, because 281669 - 2⁴ = 281653 is a prime.

It is a super-2 number, since 2×281669² = 158674851122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140834 + 140835.

It is an arithmetic number, because the mean of its divisors is an integer number (140835).

2²⁸¹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

281669 is a deficient number, since it is larger than the sum of its proper divisors (1).

281669 is an equidigital number, since it uses as much as digits as its factorization.

281669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 281669 is about 530.7249758585. The cubic root of 281669 is about 65.5510547305.

The spelling of 281669 in words is "two hundred eighty-one thousand, six hundred sixty-nine".