720746291 has 2 divisors, whose sum is σ = 720746292. Its totient is φ = 720746290.

The previous prime is 720746287. The next prime is 720746317. The reversal of 720746291 is 192647027.

It is a weak prime.

It is an emirp because it is prime and its reverse (192647027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 720746291 - 2² = 720746287 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (720746231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360373145 + 360373146.

It is an arithmetic number, because the mean of its divisors is an integer number (360373146).

Almost surely, 2^720746291 is an apocalyptic number.

720746291 is a deficient number, since it is larger than the sum of its proper divisors (1).

720746291 is an equidigital number, since it uses as much as digits as its factorization.

720746291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 720746291 is about 26846.7184400627. The cubic root of 720746291 is about 896.5905120129.

The spelling of 720746291 in words is "seven hundred twenty million, seven hundred forty-six thousand, two hundred ninety-one".