1211530512 has 40 divisors (see below), whose sum is σ = 3131183520. Its totient is φ = 403663360.

The previous prime is 1211530511. The next prime is 1211530549. The reversal of 1211530512 is 2150351121.

It is not an unprimeable number, because it can be changed into a prime (1211530511) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 144187 + ... + 152357.

It is an arithmetic number, because the mean of its divisors is an integer number (78279588).

Almost surely, 2^1211530512 is an apocalyptic number.

1211530512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211530512 is an abundant number, since it is smaller than the sum of its proper divisors (1919653008).

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

1211530512 is a wasteful number, since it uses less digits than its factorization.

1211530512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11271 (or 11265 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 1211530512 is about 34807.0468727239. The cubic root of 1211530512 is about 1066.0513358994.

Adding to 1211530512 its reverse (2150351121), we get a palindrome (3361881633).

The spelling of 1211530512 in words is "one billion, two hundred eleven million, five hundred thirty thousand, five hundred twelve".