1211133144 has 32 divisors (see below), whose sum is σ = 3260743920. Its totient is φ = 372656256.

The previous prime is 1211133137. The next prime is 1211133163. The reversal of 1211133144 is 4413311121.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1211133144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1940607 + ... + 1941230.

Almost surely, 2^1211133144 is an apocalyptic number.

It is an amenable number.

1211133144 is an abundant number, since it is smaller than the sum of its proper divisors (2049610776).

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

1211133144 is a wasteful number, since it uses less digits than its factorization.

1211133144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3881859 (or 3881855 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

The square root of 1211133144 is about 34801.3382501306. The cubic root of 1211133144 is about 1065.9347723172.

Adding to 1211133144 its reverse (4413311121), we get a palindrome (5624444265).

It can be divided in two parts, 121 and 1133144, that added together give a triangular number (1133265 = T₁₅₀₅).

The spelling of 1211133144 in words is "one billion, two hundred eleven million, one hundred thirty-three thousand, one hundred forty-four".