281705089 has 2 divisors, whose sum is σ = 281705090. Its totient is φ = 281705088.

The previous prime is 281705057. The next prime is 281705167. The reversal of 281705089 is 980507182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230796864 + 50908225 = 15192^2 + 7135^2 .

It is a cyclic number.

It is not a de Polignac number, because 281705089 - 2⁵ = 281705057 is a prime.

It is not a weakly prime, because it can be changed into another prime (281705189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140852544 + 140852545.

It is an arithmetic number, because the mean of its divisors is an integer number (140852545).

Almost surely, 2^281705089 is an apocalyptic number.

It is an amenable number.

281705089 is a deficient number, since it is larger than the sum of its proper divisors (1).

281705089 is an equidigital number, since it uses as much as digits as its factorization.

281705089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 281705089 is about 16784.0724795861. The cubic root of 281705089 is about 655.5385419962.

The spelling of 281705089 in words is "two hundred eighty-one million, seven hundred five thousand, eighty-nine".