9551991559 has 12 divisors (see below), whose sum is σ = 10502047080. Its totient is φ = 8681354000.

The previous prime is 9551991539. The next prime is 9551991571.

9551991559 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 9551991559 - 2¹⁵ = 9551958791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9551991509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 603357 + ... + 618985.

It is an arithmetic number, because the mean of its divisors is an integer number (875170590).

Almost surely, 2^9551991559 is an apocalyptic number.

9551991559 is a deficient number, since it is larger than the sum of its proper divisors (950055521).

9551991559 is a wasteful number, since it uses less digits than its factorization.

9551991559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20702 (or 20691 counting only the distinct ones).

The product of its digits is 4100625, while the sum is 58.

The square root of 9551991559 is about 97734.2905995639. The cubic root of 9551991559 is about 2121.7683980269.

The spelling of 9551991559 in words is "nine billion, five hundred fifty-one million, nine hundred ninety-one thousand, five hundred fifty-nine".