720791 has 2 divisors, whose sum is σ = 720792. Its totient is φ = 720790.

The previous prime is 720779. The next prime is 720793. The reversal of 720791 is 197027.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720791 is a prime.

Together with 720793, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 720791.

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 720791.

It is not a weakly prime, because it can be changed into another prime (720793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360395 + 360396.

It is an arithmetic number, because the mean of its divisors is an integer number (360396).

2⁷²⁰⁷⁹¹ is an apocalyptic number.

720791 is a deficient number, since it is larger than the sum of its proper divisors (1).

720791 is an equidigital number, since it uses as much as digits as its factorization.

720791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 882, while the sum is 26.

The square root of 720791 is about 848.9941106981. The cubic root of 720791 is about 89.6609050592.

The spelling of 720791 in words is "seven hundred twenty thousand, seven hundred ninety-one".