99911173 has 4 divisors (see below), whose sum is σ = 100282860. Its totient is φ = 99539488.

The previous prime is 99911093. The next prime is 99911183. The reversal of 99911173 is 37111999.

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 32638369 + 67272804 = 5713^2 + 8202^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99911173 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99911183) 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, 185440 + ... + 185977.

It is an arithmetic number, because the mean of its divisors is an integer number (25070715).

Almost surely, 2^99911173 is an apocalyptic number.

It is an amenable number.

99911173 is a deficient number, since it is larger than the sum of its proper divisors (371687).

99911173 is a wasteful number, since it uses less digits than its factorization.

99911173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371686.

The product of its digits is 15309, while the sum is 40.

The square root of 99911173 is about 9995.5576632822. The cubic root of 99911173 is about 464.0214098449.

The spelling of 99911173 in words is "ninety-nine million, nine hundred eleven thousand, one hundred seventy-three".