1131212236 has 36 divisors (see below), whose sum is σ = 2512177416. Its totient is φ = 440731200.

The previous prime is 1131212191. The next prime is 1131212237. The reversal of 1131212236 is 6322121311.

It is a happy number.

It is a super-2 number, since 2×1131212236² = 2559282245752239392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (1131212237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 260185 + ... + 264496.

It is an arithmetic number, because the mean of its divisors is an integer number (69782706).

Almost surely, 2^1131212236 is an apocalyptic number.

It is an amenable number.

1131212236 is an abundant number, since it is smaller than the sum of its proper divisors (1380965180).

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

1131212236 is a wasteful number, since it uses less digits than its factorization.

1131212236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524710 (or 524701 counting only the distinct ones).

The product of its digits is 432, while the sum is 22.

The square root of 1131212236 is about 33633.4987177962. The cubic root of 1131212236 is about 1041.9527647584.

Adding to 1131212236 its reverse (6322121311), we get a palindrome (7453333547).

The spelling of 1131212236 in words is "one billion, one hundred thirty-one million, two hundred twelve thousand, two hundred thirty-six".