1211133136 has 20 divisors (see below), whose sum is σ = 2409992452. Its totient is φ = 589199616.

The previous prime is 1211133127. The next prime is 1211133137. The reversal of 1211133136 is 6313311121.

It can be written as a sum of positive squares in 2 ways, for example, as 457960000 + 753173136 = 21400^2 + 27444^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211133137) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1022325 + ... + 1023508.

Almost surely, 2^1211133136 is an apocalyptic number.

1211133136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1211133136 is a deficient number, since it is larger than the sum of its proper divisors (1198859316).

1211133136 is a wasteful number, since it uses less digits than its factorization.

1211133136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045878 (or 2045872 counting only the distinct ones).

The product of its digits is 324, while the sum is 22.

The square root of 1211133136 is about 34801.3381351924. The cubic root of 1211133136 is about 1065.9347699702.

Adding to 1211133136 its reverse (6313311121), we get a palindrome (7524444257).

The spelling of 1211133136 in words is "one billion, two hundred eleven million, one hundred thirty-three thousand, one hundred thirty-six".