1211566652 has 12 divisors (see below), whose sum is σ = 2156178360. Its totient is φ = 595515696.

The previous prime is 1211566639. The next prime is 1211566703. The reversal of 1211566652 is 2566651121.

It is a congruent number.

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, 2566643 + ... + 2567114.

It is an arithmetic number, because the mean of its divisors is an integer number (179681530).

Almost surely, 2^1211566652 is an apocalyptic number.

It is an amenable number.

1211566652 is a deficient number, since it is larger than the sum of its proper divisors (944611708).

1211566652 is a wasteful number, since it uses less digits than its factorization.

1211566652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5133820 (or 5133818 counting only the distinct ones).

The product of its digits is 21600, while the sum is 35.

The square root of 1211566652 is about 34807.5660166005. The cubic root of 1211566652 is about 1066.0619359109.

The spelling of 1211566652 in words is "one billion, two hundred eleven million, five hundred sixty-six thousand, six hundred fifty-two".