797040970721 has 2 divisors, whose sum is σ = 797040970722. Its totient is φ = 797040970720.

The previous prime is 797040970639. The next prime is 797040970723. The reversal of 797040970721 is 127079040797.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 399283708321 + 397757262400 = 631889^2 + 630680^2 .

It is a cyclic number.

It is not a de Polignac number, because 797040970721 - 2¹⁸ = 797040708577 is a prime.

It is a Sophie Germain prime.

Together with 797040970723, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (797040970723) 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, 398520485360 + 398520485361.

It is an arithmetic number, because the mean of its divisors is an integer number (398520485361).

Almost surely, 2^797040970721 is an apocalyptic number.

It is an amenable number.

797040970721 is a deficient number, since it is larger than the sum of its proper divisors (1).

797040970721 is an equidigital number, since it uses as much as digits as its factorization.

797040970721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1555848, while the sum is 53.

The spelling of 797040970721 in words is "seven hundred ninety-seven billion, forty million, nine hundred seventy thousand, seven hundred twenty-one".