99539891 has 8 divisors (see below), whose sum is σ = 108691968. Its totient is φ = 90405000.

The previous prime is 99539863. The next prime is 99539893. The reversal of 99539891 is 19893599.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99539891 - 2⁶ = 99539827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99539893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9866 + ... + 17216.

It is an arithmetic number, because the mean of its divisors is an integer number (13586496).

Almost surely, 2^99539891 is an apocalyptic number.

99539891 is a deficient number, since it is larger than the sum of its proper divisors (9152077).

99539891 is a wasteful number, since it uses less digits than its factorization.

99539891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8593.

The product of its digits is 787320, while the sum is 53.

The square root of 99539891 is about 9976.9680264096. The cubic root of 99539891 is about 463.4459098233.

The spelling of 99539891 in words is "ninety-nine million, five hundred thirty-nine thousand, eight hundred ninety-one".