12161689 has 2 divisors, whose sum is σ = 12161690. Its totient is φ = 12161688.

The previous prime is 12161683. The next prime is 12161711. The reversal of 12161689 is 98616121.

12161689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10673289 + 1488400 = 3267^2 + 1220^2 .

It is an emirp because it is prime and its reverse (98616121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12161689 - 2¹³ = 12153497 is a prime.

It is not a weakly prime, because it can be changed into another prime (12161683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6080844 + 6080845.

It is an arithmetic number, because the mean of its divisors is an integer number (6080845).

Almost surely, 2^12161689 is an apocalyptic number.

It is an amenable number.

12161689 is a deficient number, since it is larger than the sum of its proper divisors (1).

12161689 is an equidigital number, since it uses as much as digits as its factorization.

12161689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 34.

The square root of 12161689 is about 3487.3613234077. The cubic root of 12161689 is about 229.9665294710.

The spelling of 12161689 in words is "twelve million, one hundred sixty-one thousand, six hundred eighty-nine".