797703721 has 2 divisors, whose sum is σ = 797703722. Its totient is φ = 797703720.

The previous prime is 797703719. The next prime is 797703761. The reversal of 797703721 is 127307797.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 792704025 + 4999696 = 28155^2 + 2236^2 .

It is an emirp because it is prime and its reverse (127307797) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 797703721 - 2¹ = 797703719 is a prime.

Together with 797703719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (797703761) 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, 398851860 + 398851861.

It is an arithmetic number, because the mean of its divisors is an integer number (398851861).

Almost surely, 2^797703721 is an apocalyptic number.

It is an amenable number.

797703721 is a deficient number, since it is larger than the sum of its proper divisors (1).

797703721 is an equidigital number, since it uses as much as digits as its factorization.

797703721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129654, while the sum is 43.

The square root of 797703721 is about 28243.6492153546. The cubic root of 797703721 is about 927.4287169711.

The spelling of 797703721 in words is "seven hundred ninety-seven million, seven hundred three thousand, seven hundred twenty-one".