9120220091 has 4 divisors (see below), whose sum is σ = 9142964184. Its totient is φ = 9097476000.

The previous prime is 9120220079. The next prime is 9120220093. The reversal of 9120220091 is 1900220219.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9120220091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9120220091.

It is not an unprimeable number, because it can be changed into a prime (9120220093) 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, 11371445 + ... + 11372246.

It is an arithmetic number, because the mean of its divisors is an integer number (2285741046).

Almost surely, 2^9120220091 is an apocalyptic number.

9120220091 is a deficient number, since it is larger than the sum of its proper divisors (22744093).

9120220091 is a wasteful number, since it uses less digits than its factorization.

9120220091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22744092.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 9120220091 is about 95499.8434082486. The cubic root of 9120220091 is about 2089.3046602877.

The spelling of 9120220091 in words is "nine billion, one hundred twenty million, two hundred twenty thousand, ninety-one".