12171530 has 64 divisors (see below), whose sum is σ = 26542080. Its totient is φ = 3931200.

The previous prime is 12171529. The next prime is 12171539. The reversal of 12171530 is 3517121.

12171530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12171530² = 296292285081800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12171539) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154031 + ... + 154109.

It is an arithmetic number, because the mean of its divisors is an integer number (414720).

Almost surely, 2^12171530 is an apocalyptic number.

12171530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12171530 is an abundant number, since it is smaller than the sum of its proper divisors (14370550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12171530 is a wasteful number, since it uses less digits than its factorization.

12171530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 12171530 is about 3488.7719902567. The cubic root of 12171530 is about 230.0285408816.

Adding to 12171530 its reverse (3517121), we get a palindrome (15688651).

The spelling of 12171530 in words is "twelve million, one hundred seventy-one thousand, five hundred thirty".