797985871 has 4 divisors (see below), whose sum is σ = 798051744. Its totient is φ = 797920000.

The previous prime is 797985869. The next prime is 797985887. The reversal of 797985871 is 178589797.

797985871 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, and also an emirpimes, since its reverse is a distinct semiprime: 178589797 = 19 ⋅9399463.

It is a cyclic number.

It is not a de Polignac number, because 797985871 - 2¹ = 797985869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (797985841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8935 + ... + 40936.

It is an arithmetic number, because the mean of its divisors is an integer number (199512936).

Almost surely, 2^797985871 is an apocalyptic number.

797985871 is a deficient number, since it is larger than the sum of its proper divisors (65873).

797985871 is a wasteful number, since it uses less digits than its factorization.

797985871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65872.

The product of its digits is 8890560, while the sum is 61.

The square root of 797985871 is about 28248.6437019550. The cubic root of 797985871 is about 927.5380487778.

The spelling of 797985871 in words is "seven hundred ninety-seven million, nine hundred eighty-five thousand, eight hundred seventy-one".