660791 has 2 divisors, whose sum is σ = 660792. Its totient is φ = 660790.

The previous prime is 660787. The next prime is 660799. The reversal of 660791 is 197066.

It is a happy number.

660791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660791 - 2² = 660787 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330395 + 330396.

It is an arithmetic number, because the mean of its divisors is an integer number (330396).

2⁶⁶⁰⁷⁹¹ is an apocalyptic number.

660791 is a deficient number, since it is larger than the sum of its proper divisors (1).

660791 is an equidigital number, since it uses as much as digits as its factorization.

660791 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 660791 is about 812.8905215341. The cubic root of 660791 is about 87.1006454037.

The spelling of 660791 in words is "six hundred sixty thousand, seven hundred ninety-one".