99155905 has 4 divisors (see below), whose sum is σ = 118987092. Its totient is φ = 79324720.

The previous prime is 99155899. The next prime is 99155909. The reversal of 99155905 is 50955199.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 48219136 + 50936769 = 6944^2 + 7137^2 .

It is not a de Polignac number, because 99155905 - 2³ = 99155897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99155909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9915586 + ... + 9915595.

It is an arithmetic number, because the mean of its divisors is an integer number (29746773).

Almost surely, 2^99155905 is an apocalyptic number.

It is an amenable number.

99155905 is a deficient number, since it is larger than the sum of its proper divisors (19831187).

99155905 is a wasteful number, since it uses less digits than its factorization.

99155905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19831186.

The product of its (nonzero) digits is 91125, while the sum is 43.

The square root of 99155905 is about 9957.7058100749. The cubic root of 99155905 is about 462.8492108175.

The spelling of 99155905 in words is "ninety-nine million, one hundred fifty-five thousand, nine hundred five".