797241721 has 2 divisors, whose sum is σ = 797241722. Its totient is φ = 797241720.

The previous prime is 797241677. The next prime is 797241743. The reversal of 797241721 is 127142797.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 776402496 + 20839225 = 27864^2 + 4565^2 .

It is an emirp because it is prime and its reverse (127142797) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 797241721 - 2⁷ = 797241593 is a prime.

It is not a weakly prime, because it can be changed into another prime (797247721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 398620860 + 398620861.

It is an arithmetic number, because the mean of its divisors is an integer number (398620861).

Almost surely, 2^797241721 is an apocalyptic number.

It is an amenable number.

797241721 is a deficient number, since it is larger than the sum of its proper divisors (1).

797241721 is an equidigital number, since it uses as much as digits as its factorization.

797241721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49392, while the sum is 40.

The square root of 797241721 is about 28235.4692009890. The cubic root of 797241721 is about 927.2496384483.

The spelling of 797241721 in words is "seven hundred ninety-seven million, two hundred forty-one thousand, seven hundred twenty-one".