660917 has 2 divisors, whose sum is σ = 660918. Its totient is φ = 660916.

The previous prime is 660901. The next prime is 660923. The reversal of 660917 is 719066.

It is a happy number.

660917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 579121 + 81796 = 761^2 + 286^2 .

It is a cyclic number.

It is not a de Polignac number, because 660917 - 2⁴ = 660901 is a prime.

It is a super-2 number, since 2×660917² = 873622561778, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 660917.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660917.

It is not a weakly prime, because it can be changed into another prime (660217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330458 + 330459.

It is an arithmetic number, because the mean of its divisors is an integer number (330459).

2⁶⁶⁰⁹¹⁷ is an apocalyptic number.

It is an amenable number.

660917 is a deficient number, since it is larger than the sum of its proper divisors (1).

660917 is an equidigital number, since it uses as much as digits as its factorization.

660917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 660917 is about 812.9680190512. The cubic root of 660917 is about 87.1061811852.

The spelling of 660917 in words is "six hundred sixty thousand, nine hundred seventeen".