1131205312 has 28 divisors (see below), whose sum is σ = 2246493856. Its totient is φ = 565159680.

The previous prime is 1131205277. The next prime is 1131205321. The reversal of 1131205312 is 2135021311.

It is a self number, because there is not a number n which added to its sum of digits gives 1131205312.

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, 84862 + ... + 97282.

Almost surely, 2^1131205312 is an apocalyptic number.

It is an amenable number.

1131205312 is a deficient number, since it is larger than the sum of its proper divisors (1115288544).

1131205312 is a wasteful number, since it uses less digits than its factorization.

1131205312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13856 (or 13846 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1131205312 is about 33633.3957845472. The cubic root of 1131205312 is about 1041.9506388692.

Adding to 1131205312 its reverse (2135021311), we get a palindrome (3266226623).

The spelling of 1131205312 in words is "one billion, one hundred thirty-one million, two hundred five thousand, three hundred twelve".