660281 has 2 divisors, whose sum is σ = 660282. Its totient is φ = 660280.

The previous prime is 660277. The next prime is 660299. The reversal of 660281 is 182066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 341056 + 319225 = 584^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 660281 - 2² = 660277 is a prime.

It is a super-2 number, since 2×660281² = 871941997922, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660281.

It is not a weakly prime, because it can be changed into another prime (660241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330140 + 330141.

It is an arithmetic number, because the mean of its divisors is an integer number (330141).

2⁶⁶⁰²⁸¹ is an apocalyptic number.

It is an amenable number.

660281 is a deficient number, since it is larger than the sum of its proper divisors (1).

660281 is an equidigital number, since it uses as much as digits as its factorization.

660281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 660281 is about 812.5767656043. The cubic root of 660281 is about 87.0782314774.

The spelling of 660281 in words is "six hundred sixty thousand, two hundred eighty-one".