726810991 has 2 divisors, whose sum is σ = 726810992. Its totient is φ = 726810990.

The previous prime is 726810989. The next prime is 726811003. The reversal of 726810991 is 199018627.

726810991 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 (199018627) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 726810991 - 2¹ = 726810989 is a prime.

Together with 726810989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (726810941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363405495 + 363405496.

It is an arithmetic number, because the mean of its divisors is an integer number (363405496).

Almost surely, 2^726810991 is an apocalyptic number.

726810991 is a deficient number, since it is larger than the sum of its proper divisors (1).

726810991 is an equidigital number, since it uses as much as digits as its factorization.

726810991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 726810991 is about 26959.4323196910. The cubic root of 726810991 is about 899.0982700896.

The spelling of 726810991 in words is "seven hundred twenty-six million, eight hundred ten thousand, nine hundred ninety-one".