9951558791 has 2 divisors, whose sum is σ = 9951558792. Its totient is φ = 9951558790.

The previous prime is 9951558781. The next prime is 9951558797. The reversal of 9951558791 is 1978551599.

It is a strong prime.

It is an emirp because it is prime and its reverse (1978551599) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9951558791 - 2³⁰ = 8877816967 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9951558791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9951558797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4975779395 + 4975779396.

It is an arithmetic number, because the mean of its divisors is an integer number (4975779396).

Almost surely, 2^9951558791 is an apocalyptic number.

9951558791 is a deficient number, since it is larger than the sum of its proper divisors (1).

9951558791 is an equidigital number, since it uses as much as digits as its factorization.

9951558791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5103000, while the sum is 59.

The square root of 9951558791 is about 99757.4999235646. The cubic root of 9951558791 is about 2150.9502769513.

The spelling of 9951558791 in words is "nine billion, nine hundred fifty-one million, five hundred fifty-eight thousand, seven hundred ninety-one".