1212166 has 4 divisors (see below), whose sum is σ = 1818252. Its totient is φ = 606082.

The previous prime is 1212149. The next prime is 1212173. The reversal of 1212166 is 6612121.

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

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 303040 + ... + 303043.

It is an arithmetic number, because the mean of its divisors is an integer number (454563).

2^1212166 is an apocalyptic number.

1212166 is a deficient number, since it is larger than the sum of its proper divisors (606086).

1212166 is an equidigital number, since it uses as much as digits as its factorization.

1212166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606085.

The product of its digits is 144, while the sum is 19.

The square root of 1212166 is about 1100.9841052440. The cubic root of 1212166 is about 106.6237696432.

Adding to 1212166 its reverse (6612121), we get a palindrome (7824287).

It can be divided in two parts, 1212 and 166, that added together give a triangular number (1378 = T₅₂).

The spelling of 1212166 in words is "one million, two hundred twelve thousand, one hundred sixty-six".