12117531 has 8 divisors (see below), whose sum is σ = 16323664. Its totient is φ = 7994880.

The previous prime is 12117517. The next prime is 12117551. The reversal of 12117531 is 13571121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12117531 - 2¹⁴ = 12101147 is a prime.

It is a super-2 number, since 2×12117531² = 293669115071922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12117498 and 12117507.

It is not an unprimeable number, because it can be changed into a prime (12117551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20530 + ... + 21111.

It is an arithmetic number, because the mean of its divisors is an integer number (2040458).

Almost surely, 2^12117531 is an apocalyptic number.

12117531 is a deficient number, since it is larger than the sum of its proper divisors (4206133).

12117531 is an equidigital number, since it uses as much as digits as its factorization.

12117531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41741.

The product of its digits is 210, while the sum is 21.

The square root of 12117531 is about 3481.0244181850. The cubic root of 12117531 is about 229.6878626585.

Adding to 12117531 its reverse (13571121), we get a palindrome (25688652).

The spelling of 12117531 in words is "twelve million, one hundred seventeen thousand, five hundred thirty-one".