12117550 has 48 divisors (see below), whose sum is σ = 24185952. Its totient is φ = 4505600.

The previous prime is 12117517. The next prime is 12117551. The reversal of 12117550 is 5571121.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 47022 + ... + 47278.

It is an arithmetic number, because the mean of its divisors is an integer number (503874).

Almost surely, 2^12117550 is an apocalyptic number.

12117550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12117550 is a deficient number, since it is larger than the sum of its proper divisors (12068402).

12117550 is a wasteful number, since it uses less digits than its factorization.

12117550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 22.

The square root of 12117550 is about 3481.0271472656. The cubic root of 12117550 is about 229.6879827068.

Adding to 12117550 its reverse (5571121), we get a palindrome (17688671).

It can be divided in two parts, 121 and 17550, that added together give a palindrome (17671).

The spelling of 12117550 in words is "twelve million, one hundred seventeen thousand, five hundred fifty".