99891048191 has 16 divisors (see below), whose sum is σ = 115076332800. Its totient is φ = 85753886400.

The previous prime is 99891048091. The next prime is 99891048199. The reversal of 99891048191 is 19184019899.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99891048191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99891048191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99891048199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 703406 + ... + 833403.

It is an arithmetic number, because the mean of its divisors is an integer number (7192270800).

Almost surely, 2^99891048191 is an apocalyptic number.

99891048191 is a deficient number, since it is larger than the sum of its proper divisors (15185284609).

99891048191 is a wasteful number, since it uses less digits than its factorization.

99891048191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1537150.

The product of its (nonzero) digits is 1679616, while the sum is 59.

The spelling of 99891048191 in words is "ninety-nine billion, eight hundred ninety-one million, forty-eight thousand, one hundred ninety-one".