9120821775 has 48 divisors (see below), whose sum is σ = 16391700864. Its totient is φ = 4448234880.

The previous prime is 9120821729. The next prime is 9120821791. The reversal of 9120821775 is 5771280219.

9120821775 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9120821775 - 2⁹ = 9120821263 is a prime.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 60612 + ... + 148038.

It is an arithmetic number, because the mean of its divisors is an integer number (341493768).

Almost surely, 2^9120821775 is an apocalyptic number.

9120821775 is a deficient number, since it is larger than the sum of its proper divisors (7270879089).

9120821775 is a wasteful number, since it uses less digits than its factorization.

9120821775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87560 (or 87555 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 42.

The square root of 9120821775 is about 95502.9935394697. The cubic root of 9120821775 is about 2089.3506048493.

The spelling of 9120821775 in words is "nine billion, one hundred twenty million, eight hundred twenty-one thousand, seven hundred seventy-five".