797450213983921 has 3 divisors (see below), whose sum is σ = 797450242223083. Its totient is φ = 797450185744760.

The previous prime is 797450213983901. The next prime is 797450213983933. The reversal of 797450213983921 is 129389312054797.

The square root of 797450213983921 is 28239161.

It is a perfect power (a square), and thus also a powerful number.

797450213983921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 45190137414321 + 752260076569600 = 6722361^2 + 27427360^2 .

It is not a de Polignac number, because 797450213983921 - 2³⁵ = 797415854245553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (797450213983901) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 14119581 + ... + 42358741.

Almost surely, 2^{797450213983921} is an apocalyptic number.

797450213983921 is the 28239161-st square number.

797450213983921 is the 14119581-st centered octagonal number.

It is an amenable number.

797450213983921 is a deficient number, since it is larger than the sum of its proper divisors (28239162).

797450213983921 is an frugal number, since it uses more digits than its factorization.

797450213983921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56478322 (or 28239161 counting only the distinct ones).

The product of its (nonzero) digits is 205752960, while the sum is 70.

The spelling of 797450213983921 in words is "seven hundred ninety-seven trillion, four hundred fifty billion, two hundred thirteen million, nine hundred eighty-three thousand, nine hundred twenty-one".