99888791 has 2 divisors, whose sum is σ = 99888792. Its totient is φ = 99888790.

The previous prime is 99888779. The next prime is 99888809. The reversal of 99888791 is 19788899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99888791 - 2¹⁴ = 99872407 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99888791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99888721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49944395 + 49944396.

It is an arithmetic number, because the mean of its divisors is an integer number (49944396).

Almost surely, 2^99888791 is an apocalyptic number.

99888791 is a deficient number, since it is larger than the sum of its proper divisors (1).

99888791 is an equidigital number, since it uses as much as digits as its factorization.

99888791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 59.

The square root of 99888791 is about 9994.4380032096. The cubic root of 99888791 is about 463.9867573881.

The spelling of 99888791 in words is "ninety-nine million, eight hundred eighty-eight thousand, seven hundred ninety-one".