1211435166 has 8 divisors (see below), whose sum is σ = 2422870344. Its totient is φ = 403811720.

The previous prime is 1211435161. The next prime is 1211435177. The reversal of 1211435166 is 6615341121.

It is a happy number.

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

1211435166 is an admirable number.

It is a super-3 number, since 3×1211435166³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211435161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100952925 + ... + 100952936.

It is an arithmetic number, because the mean of its divisors is an integer number (302858793).

Almost surely, 2^1211435166 is an apocalyptic number.

1211435166 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.

1211435166 is a wasteful number, since it uses less digits than its factorization.

1211435166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201905866.

The product of its digits is 4320, while the sum is 30.

The square root of 1211435166 is about 34805.6772093289. The cubic root of 1211435166 is about 1066.0233695114.

Adding to 1211435166 its reverse (6615341121), we get a palindrome (7826776287).

The spelling of 1211435166 in words is "one billion, two hundred eleven million, four hundred thirty-five thousand, one hundred sixty-six".