99355891 has 4 divisors (see below), whose sum is σ = 99826984. Its totient is φ = 98884800.

The previous prime is 99355873. The next prime is 99355931. The reversal of 99355891 is 19855399.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19855399 = 19 ⋅1045021.

It is a cyclic number.

It is not a de Polignac number, because 99355891 - 2⁵ = 99355859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99355801) 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, 235230 + ... + 235651.

It is an arithmetic number, because the mean of its divisors is an integer number (24956746).

Almost surely, 2^99355891 is an apocalyptic number.

99355891 is a deficient number, since it is larger than the sum of its proper divisors (471093).

99355891 is a wasteful number, since it uses less digits than its factorization.

99355891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471092.

The product of its digits is 437400, while the sum is 49.

The square root of 99355891 is about 9967.7425227581. The cubic root of 99355891 is about 463.1601729737.

The spelling of 99355891 in words is "ninety-nine million, three hundred fifty-five thousand, eight hundred ninety-one".