660493 has 2 divisors, whose sum is σ = 660494. Its totient is φ = 660492.

The previous prime is 660449. The next prime is 660503. The reversal of 660493 is 394066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 432964 + 227529 = 658^2 + 477^2 .

It is a cyclic number.

It is not a de Polignac number, because 660493 - 2¹⁷ = 529421 is a prime.

It is an Ulam number.

660493 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660403) 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, 330246 + 330247.

It is an arithmetic number, because the mean of its divisors is an integer number (330247).

2⁶⁶⁰⁴⁹³ is an apocalyptic number.

It is an amenable number.

660493 is a deficient number, since it is larger than the sum of its proper divisors (1).

660493 is an equidigital number, since it uses as much as digits as its factorization.

660493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 660493 is about 812.7072043485. The cubic root of 660493 is about 87.0875500401.

The spelling of 660493 in words is "six hundred sixty thousand, four hundred ninety-three".