99000191 has 4 divisors (see below), whose sum is σ = 100356432. Its totient is φ = 97643952.

The previous prime is 99000157. The next prime is 99000217. The reversal of 99000191 is 19100099.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99000191 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 (99000101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 678011 + ... + 678156.

It is an arithmetic number, because the mean of its divisors is an integer number (25089108).

Almost surely, 2^99000191 is an apocalyptic number.

99000191 is a deficient number, since it is larger than the sum of its proper divisors (1356241).

99000191 is a wasteful number, since it uses less digits than its factorization.

99000191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356240.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 99000191 is about 9949.8839691727. The cubic root of 99000191 is about 462.6067984192.

The spelling of 99000191 in words is "ninety-nine million, one hundred ninety-one", and thus it is an aban number.