1211525166 has 8 divisors (see below), whose sum is σ = 2423050344. Its totient is φ = 403841720.

The previous prime is 1211525153. The next prime is 1211525171. The reversal of 1211525166 is 6615251121.

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

1211525166 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 100960425 + ... + 100960436.

It is an arithmetic number, because the mean of its divisors is an integer number (302881293).

Almost surely, 2^1211525166 is an apocalyptic number.

1211525166 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211525166 is a wasteful number, since it uses less digits than its factorization.

1211525166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201920866.

The product of its digits is 3600, while the sum is 30.

The square root of 1211525166 is about 34806.9700778450. The cubic root of 1211525166 is about 1066.0497678776.

Adding to 1211525166 its reverse (6615251121), we get a palindrome (7826776287).

The spelling of 1211525166 in words is "one billion, two hundred eleven million, five hundred twenty-five thousand, one hundred sixty-six".