12609181 has 12 divisors (see below), whose sum is σ = 13942516. Its totient is φ = 11335680.

The previous prime is 12609173. The next prime is 12609227. The reversal of 12609181 is 18190621.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1988100 + 10621081 = 1410^2 + 3259^2 .

It is not a de Polignac number, because 12609181 - 2³ = 12609173 is a prime.

It is a super-2 number, since 2×12609181² = 317982890981522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12609101) 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 11 ways as a sum of consecutive naturals, for example, 21565 + ... + 22141.

Almost surely, 2^12609181 is an apocalyptic number.

It is an amenable number.

12609181 is a deficient number, since it is larger than the sum of its proper divisors (1333335).

12609181 is an equidigital number, since it uses as much as digits as its factorization.

12609181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672 (or 631 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 12609181 is about 3550.9408612366. The cubic root of 12609181 is about 232.7531816294.

The spelling of 12609181 in words is "twelve million, six hundred nine thousand, one hundred eighty-one".