9220578721 has 4 divisors (see below), whose sum is σ = 9621473472. Its totient is φ = 8819683972.

The previous prime is 9220578649. The next prime is 9220578737. The reversal of 9220578721 is 1278750229.

9220578721 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 Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9220578721 - 2¹⁵ = 9220545953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9220578751) 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 3 ways as a sum of consecutive naturals, for example, 200447341 + ... + 200447386.

It is an arithmetic number, because the mean of its divisors is an integer number (2405368368).

Almost surely, 2^9220578721 is an apocalyptic number.

It is an amenable number.

9220578721 is a deficient number, since it is larger than the sum of its proper divisors (400894751).

9220578721 is a wasteful number, since it uses less digits than its factorization.

9220578721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400894750.

The product of its (nonzero) digits is 141120, while the sum is 43.

The square root of 9220578721 is about 96023.8445439465. The cubic root of 9220578721 is about 2096.9402697934.

The spelling of 9220578721 in words is "nine billion, two hundred twenty million, five hundred seventy-eight thousand, seven hundred twenty-one".