12991185 has 20 divisors (see below), whose sum is σ = 23288628. Its totient is φ = 6928416.

The previous prime is 12991177. The next prime is 12991189. The reversal of 12991185 is 58119921.

12991185 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 10036224 + 2954961 = 3168^2 + 1719^2 .

It is not a de Polignac number, because 12991185 - 2³ = 12991177 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (12991189) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15634 + ... + 16443.

Almost surely, 2^12991185 is an apocalyptic number.

12991185 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12991185 is a deficient number, since it is larger than the sum of its proper divisors (10297443).

12991185 is an equidigital number, since it uses as much as digits as its factorization.

12991185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32094 (or 32085 counting only the distinct ones).

The product of its digits is 6480, while the sum is 36.

The square root of 12991185 is about 3604.3286476125. The cubic root of 12991185 is about 235.0803105621.

The spelling of 12991185 in words is "twelve million, nine hundred ninety-one thousand, one hundred eighty-five".