1211503312 has 20 divisors (see below), whose sum is σ = 2423007616. Its totient is φ = 586211040.

The previous prime is 1211503297. The next prime is 1211503339. The reversal of 1211503312 is 2133051121.

1211503312 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211503312.

It is a congruent number.

It is an unprimeable number.

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, 1220778 + ... + 1221769.

Almost surely, 2^1211503312 is an apocalyptic number.

It is an amenable number.

1211503312 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.

1211503312 is a wasteful number, since it uses less digits than its factorization.

1211503312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2442586 (or 2442580 counting only the distinct ones).

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

The square root of 1211503312 is about 34806.6561450536. The cubic root of 1211503312 is about 1066.0433578878.

Adding to 1211503312 its reverse (2133051121), we get a palindrome (3344554433).

The spelling of 1211503312 in words is "one billion, two hundred eleven million, five hundred three thousand, three hundred twelve".