9771320777 has 4 divisors (see below), whose sum is σ = 10009645716. Its totient is φ = 9532995840.

The previous prime is 9771320773. The next prime is 9771320789. The reversal of 9771320777 is 7770231779.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7770231779 = 60623 ⋅128173.

It can be written as a sum of positive squares in 2 ways, for example, as 2691949456 + 7079371321 = 51884^2 + 84139^2 .

It is a cyclic number.

It is not a de Polignac number, because 9771320777 - 2² = 9771320773 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9771320773) 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, 119162408 + ... + 119162489.

It is an arithmetic number, because the mean of its divisors is an integer number (2502411429).

Almost surely, 2^9771320777 is an apocalyptic number.

It is an amenable number.

9771320777 is a deficient number, since it is larger than the sum of its proper divisors (238324939).

9771320777 is a wasteful number, since it uses less digits than its factorization.

9771320777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238324938.

The product of its (nonzero) digits is 907578, while the sum is 50.

The square root of 9771320777 is about 98849.9912847745. The cubic root of 9771320777 is about 2137.8854106255.

The spelling of 9771320777 in words is "nine billion, seven hundred seventy-one million, three hundred twenty thousand, seven hundred seventy-seven".