281641 has 2 divisors, whose sum is σ = 281642. Its totient is φ = 281640.

The previous prime is 281627. The next prime is 281647. The reversal of 281641 is 146182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189225 + 92416 = 435^2 + 304^2 .

It is a cyclic number.

It is not a de Polignac number, because 281641 - 2⁵ = 281609 is a prime.

It is not a weakly prime, because it can be changed into another prime (281647) 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, 140820 + 140821.

It is an arithmetic number, because the mean of its divisors is an integer number (140821).

2²⁸¹⁶⁴¹ is an apocalyptic number.

It is an amenable number.

281641 is a deficient number, since it is larger than the sum of its proper divisors (1).

281641 is an equidigital number, since it uses as much as digits as its factorization.

281641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 22.

The square root of 281641 is about 530.6985961918. The cubic root of 281641 is about 65.5488825706.

The spelling of 281641 in words is "two hundred eighty-one thousand, six hundred forty-one".