12181550 has 12 divisors (see below), whose sum is σ = 22657776. Its totient is φ = 4872600.

The previous prime is 12181531. The next prime is 12181567. The reversal of 12181550 is 5518121.

12181550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 121766 + ... + 121865.

It is an arithmetic number, because the mean of its divisors is an integer number (1888148).

Almost surely, 2^12181550 is an apocalyptic number.

12181550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12181550 is a deficient number, since it is larger than the sum of its proper divisors (10476226).

12181550 is a wasteful number, since it uses less digits than its factorization.

12181550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243643 (or 243638 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 12181550 is about 3490.2077302075. The cubic root of 12181550 is about 230.0916458975.

Adding to 12181550 its reverse (5518121), we get a palindrome (17699671).

The spelling of 12181550 in words is "twelve million, one hundred eighty-one thousand, five hundred fifty".