12161681 has 8 divisors (see below), whose sum is σ = 14716800. Its totient is φ = 9811008.

The previous prime is 12161663. The next prime is 12161683. The reversal of 12161681 is 18616121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12161681 is a prime.

It is a super-2 number, since 2×12161681² = 295812969491522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12161681.

It is not an unprimeable number, because it can be changed into a prime (12161683) 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 7 ways as a sum of consecutive naturals, for example, 50981 + ... + 51218.

It is an arithmetic number, because the mean of its divisors is an integer number (1839600).

Almost surely, 2^12161681 is an apocalyptic number.

It is an amenable number.

12161681 is a deficient number, since it is larger than the sum of its proper divisors (2555119).

12161681 is a wasteful number, since it uses less digits than its factorization.

12161681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102223.

The product of its digits is 576, while the sum is 26.

The square root of 12161681 is about 3487.3601764085. The cubic root of 12161681 is about 229.9664790467.

The spelling of 12161681 in words is "twelve million, one hundred sixty-one thousand, six hundred eighty-one".