12163781 has 8 divisors (see below), whose sum is σ = 14633280. Its totient is φ = 9877248.

The previous prime is 12163769. The next prime is 12163807. The reversal of 12163781 is 18736121.

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

It is a cyclic number.

It is not a de Polignac number, because 12163781 - 2¹⁴ = 12147397 is a prime.

It is a super-2 number, since 2×12163781² = 295915136431922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12163181) 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, 45596 + ... + 45861.

It is an arithmetic number, because the mean of its divisors is an integer number (1829160).

Almost surely, 2^12163781 is an apocalyptic number.

It is an amenable number.

12163781 is a deficient number, since it is larger than the sum of its proper divisors (2469499).

12163781 is an equidigital number, since it uses as much as digits as its factorization.

12163781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91483.

The product of its digits is 2016, while the sum is 29.

The square root of 12163781 is about 3487.6612507524. The cubic root of 12163781 is about 229.9797146571.

The spelling of 12163781 in words is "twelve million, one hundred sixty-three thousand, seven hundred eighty-one".