99191855 has 32 divisors (see below), whose sum is σ = 147142656. Its totient is φ = 62636544.

The previous prime is 99191849. The next prime is 99191863. The reversal of 99191855 is 55819199.

It is a cyclic number.

It is not a de Polignac number, because 99191855 - 2²⁶ = 32082991 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26192 + ... + 29738.

It is an arithmetic number, because the mean of its divisors is an integer number (4598208).

Almost surely, 2^99191855 is an apocalyptic number.

99191855 is a deficient number, since it is larger than the sum of its proper divisors (47950801).

99191855 is a wasteful number, since it uses less digits than its factorization.

99191855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3623.

The product of its digits is 145800, while the sum is 47.

The square root of 99191855 is about 9959.5107811579. The cubic root of 99191855 is about 462.9051409832.

The spelling of 99191855 in words is "ninety-nine million, one hundred ninety-one thousand, eight hundred fifty-five".