12169881 has 6 divisors (see below), whose sum is σ = 17578730. Its totient is φ = 8113248.

The previous prime is 12169853. The next prime is 12169891. The reversal of 12169881 is 18896121.

It can be written as a sum of positive squares in only one way, i.e., 7241481 + 4928400 = 2691^2 + 2220^2 .

It is not a de Polignac number, because 12169881 - 2¹³ = 12161689 is a prime.

It is a super-2 number, since 2×12169881² = 296212007108322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12169831) 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 5 ways as a sum of consecutive naturals, for example, 676096 + ... + 676113.

Almost surely, 2^12169881 is an apocalyptic number.

It is an amenable number.

12169881 is a deficient number, since it is larger than the sum of its proper divisors (5408849).

12169881 is a wasteful number, since it uses less digits than its factorization.

12169881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352215 (or 1352212 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 12169881 is about 3488.5356526772. The cubic root of 12169881 is about 230.0181523165.

The spelling of 12169881 in words is "twelve million, one hundred sixty-nine thousand, eight hundred eighty-one".