12691189 has 8 divisors (see below), whose sum is σ = 14654528. Its totient is φ = 10765440.

The previous prime is 12691187. The next prime is 12691199. The reversal of 12691189 is 98119621.

12691189 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12691189 - 2¹ = 12691187 is a prime.

It is a super-2 number, since 2×12691189² = 322132556467442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12691187) 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 7 ways as a sum of consecutive naturals, for example, 8667 + ... + 10024.

It is an arithmetic number, because the mean of its divisors is an integer number (1831816).

Almost surely, 2^12691189 is an apocalyptic number.

It is an amenable number.

12691189 is a deficient number, since it is larger than the sum of its proper divisors (1963339).

12691189 is an equidigital number, since it uses as much as digits as its factorization.

12691189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18795.

The product of its digits is 7776, while the sum is 37.

The square root of 12691189 is about 3562.4695086414. The cubic root of 12691189 is about 233.2566875244.

It can be divided in two parts, 12691 and 189, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 12691189 in words is "twelve million, six hundred ninety-one thousand, one hundred eighty-nine".