1217512166 has 48 divisors (see below), whose sum is σ = 2059250688. Its totient is φ = 539042400.

The previous prime is 1217512159. The next prime is 1217512169. The reversal of 1217512166 is 6612157121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217512169) 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 23 ways as a sum of consecutive naturals, for example, 1372175 + ... + 1373061.

It is an arithmetic number, because the mean of its divisors is an integer number (42901056).

Almost surely, 2^1217512166 is an apocalyptic number.

1217512166 is a deficient number, since it is larger than the sum of its proper divisors (841738522).

1217512166 is a wasteful number, since it uses less digits than its factorization.

1217512166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077 (or 1064 counting only the distinct ones).

The product of its digits is 5040, while the sum is 32.

The square root of 1217512166 is about 34892.8669787967. The cubic root of 1217512166 is about 1067.8029176894.

Adding to 1217512166 its reverse (6612157121), we get a palindrome (7829669287).

The spelling of 1217512166 in words is "one billion, two hundred seventeen million, five hundred twelve thousand, one hundred sixty-six".