12117507 has 4 divisors (see below), whose sum is σ = 16156680. Its totient is φ = 8078336.

The previous prime is 12117503. The next prime is 12117517. The reversal of 12117507 is 70571121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70571121 = 3 ⋅23523707.

It is a cyclic number.

It is not a de Polignac number, because 12117507 - 2² = 12117503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12117503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2019582 + ... + 2019587.

It is an arithmetic number, because the mean of its divisors is an integer number (4039170).

Almost surely, 2^12117507 is an apocalyptic number.

12117507 is a deficient number, since it is larger than the sum of its proper divisors (4039173).

12117507 is an equidigital number, since it uses as much as digits as its factorization.

12117507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4039172.

The product of its (nonzero) digits is 490, while the sum is 24.

The square root of 12117507 is about 3481.0209709222. The cubic root of 12117507 is about 229.6877110184.

Adding to 12117507 its reverse (70571121), we get a palindrome (82688628).

The spelling of 12117507 in words is "twelve million, one hundred seventeen thousand, five hundred seven".