785469991 has 2 divisors, whose sum is σ = 785469992. Its totient is φ = 785469990.

The previous prime is 785469973. The next prime is 785470043. The reversal of 785469991 is 199964587.

785469991 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 an emirp because it is prime and its reverse (199964587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 785469991 - 2¹⁵ = 785437223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (785469931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 392734995 + 392734996.

It is an arithmetic number, because the mean of its divisors is an integer number (392734996).

Almost surely, 2^785469991 is an apocalyptic number.

785469991 is a deficient number, since it is larger than the sum of its proper divisors (1).

785469991 is an equidigital number, since it uses as much as digits as its factorization.

785469991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4898880, while the sum is 58.

The square root of 785469991 is about 28026.2375462708. The cubic root of 785469991 is about 922.6631996086.

The spelling of 785469991 in words is "seven hundred eighty-five million, four hundred sixty-nine thousand, nine hundred ninety-one".