9579977991 has 6 divisors (see below), whose sum is σ = 13837746000. Its totient is φ = 6386651988.

The previous prime is 9579977971. The next prime is 9579977999. The reversal of 9579977991 is 1997799759.

It is not a de Polignac number, because 9579977991 - 2¹¹ = 9579975943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9579977999) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 532220991 + ... + 532221008.

It is an arithmetic number, because the mean of its divisors is an integer number (2306291000).

Almost surely, 2^9579977991 is an apocalyptic number.

9579977991 is a deficient number, since it is larger than the sum of its proper divisors (4257768009).

9579977991 is a wasteful number, since it uses less digits than its factorization.

9579977991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064442005 (or 1064442002 counting only the distinct ones).

The product of its digits is 101269035, while the sum is 72.

The square root of 9579977991 is about 97877.3619944878. The cubic root of 9579977991 is about 2123.8385711259.

The spelling of 9579977991 in words is "nine billion, five hundred seventy-nine million, nine hundred seventy-seven thousand, nine hundred ninety-one".