791221871 has 16 divisors (see below), whose sum is σ = 917215488. Its totient is φ = 674544000.

The previous prime is 791221859. The next prime is 791221889. The reversal of 791221871 is 178122197.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-791221871 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 (791221831) 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 in 15 ways as a sum of consecutive naturals, for example, 45446 + ... + 60396.

It is an arithmetic number, because the mean of its divisors is an integer number (57325968).

Almost surely, 2^791221871 is an apocalyptic number.

791221871 is a deficient number, since it is larger than the sum of its proper divisors (125993617).

791221871 is a wasteful number, since it uses less digits than its factorization.

791221871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15262.

The product of its digits is 14112, while the sum is 38.

The square root of 791221871 is about 28128.6663565836. Note that the first 3 decimals coincide. The cubic root of 791221871 is about 924.9098995756.

The spelling of 791221871 in words is "seven hundred ninety-one million, two hundred twenty-one thousand, eight hundred seventy-one".