12171115 has 24 divisors (see below), whose sum is σ = 16843248. Its totient is φ = 8372160.

The previous prime is 12171101. The next prime is 12171119. The reversal of 12171115 is 51117121.

12171115 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12171115 - 2¹³ = 12162923 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12171092 and 12171101.

It is not an unprimeable number, because it can be changed into a prime (12171119) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19549 + ... + 20161.

It is an arithmetic number, because the mean of its divisors is an integer number (701802).

Almost surely, 2^12171115 is an apocalyptic number.

12171115 is a deficient number, since it is larger than the sum of its proper divisors (4672133).

12171115 is a wasteful number, since it uses less digits than its factorization.

12171115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667 (or 648 counting only the distinct ones).

The product of its digits is 70, while the sum is 19.

The square root of 12171115 is about 3488.7125132346. The cubic root of 12171115 is about 230.0259265039.

Adding to 12171115 its reverse (51117121), we get a palindrome (63288236).

It can be divided in two parts, 1217 and 1115, that added together give a palindrome (2332).

The spelling of 12171115 in words is "twelve million, one hundred seventy-one thousand, one hundred fifteen".