12172099 has 4 divisors (see below), whose sum is σ = 12213936. Its totient is φ = 12130264.

The previous prime is 12172087. The next prime is 12172117. The reversal of 12172099 is 99027121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99027121 = 23 ⋅4305527.

It is a cyclic number.

It is not a de Polignac number, because 12172099 - 2¹⁷ = 12041027 is a prime.

It is a Smith number, since the sum of its digits (31) 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 self number, because there is not a number n which added to its sum of digits gives 12172099.

It is not an unprimeable number, because it can be changed into a prime (12172019) 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, 20479 + ... + 21064.

It is an arithmetic number, because the mean of its divisors is an integer number (3053484).

Almost surely, 2^12172099 is an apocalyptic number.

12172099 is a deficient number, since it is larger than the sum of its proper divisors (41837).

12172099 is an equidigital number, since it uses as much as digits as its factorization.

12172099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41836.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 12172099 is about 3488.8535366220. The cubic root of 12172099 is about 230.0321253173.

The spelling of 12172099 in words is "twelve million, one hundred seventy-two thousand, ninety-nine".