785928991 has 2 divisors, whose sum is σ = 785928992. Its totient is φ = 785928990.

The previous prime is 785928953. The next prime is 785929009. The reversal of 785928991 is 199829587.

It is a strong prime.

It is an emirp because it is prime and its reverse (199829587) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-785928991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (785928191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 392964495 + 392964496.

It is an arithmetic number, because the mean of its divisors is an integer number (392964496).

Almost surely, 2^785928991 is an apocalyptic number.

785928991 is a deficient number, since it is larger than the sum of its proper divisors (1).

785928991 is an equidigital number, since it uses as much as digits as its factorization.

785928991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 58.

The square root of 785928991 is about 28034.4251055733. The cubic root of 785928991 is about 922.8428881803.

The spelling of 785928991 in words is "seven hundred eighty-five million, nine hundred twenty-eight thousand, nine hundred ninety-one".