12161785 has 4 divisors (see below), whose sum is σ = 14594148. Its totient is φ = 9729424.

The previous prime is 12161777. The next prime is 12161801. The reversal of 12161785 is 58716121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2446096 + 9715689 = 1564^2 + 3117^2 .

It is a cyclic number.

It is not a de Polignac number, because 12161785 - 2³ = 12161777 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1216174 + ... + 1216183.

It is an arithmetic number, because the mean of its divisors is an integer number (3648537).

Almost surely, 2^12161785 is an apocalyptic number.

It is an amenable number.

12161785 is a deficient number, since it is larger than the sum of its proper divisors (2432363).

12161785 is an equidigital number, since it uses as much as digits as its factorization.

12161785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2432362.

The product of its digits is 3360, while the sum is 31.

The square root of 12161785 is about 3487.3750873687. The cubic root of 12161785 is about 229.9671345604.

The spelling of 12161785 in words is "twelve million, one hundred sixty-one thousand, seven hundred eighty-five".