1211545552 has 20 divisors (see below), whose sum is σ = 2682708256. Its totient is φ = 519233760.

The previous prime is 1211545549. The next prime is 1211545561. The reversal of 1211545552 is 2555451121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5408574 + ... + 5408797.

Almost surely, 2^1211545552 is an apocalyptic number.

It is an amenable number.

1211545552 is an abundant number, since it is smaller than the sum of its proper divisors (1471162704).

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

1211545552 is a wasteful number, since it uses less digits than its factorization.

1211545552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10817386 (or 10817380 counting only the distinct ones).

The product of its digits is 10000, while the sum is 31.

The square root of 1211545552 is about 34807.2629202585. The cubic root of 1211545552 is about 1066.0557472193.

Adding to 1211545552 its reverse (2555451121), we get a palindrome (3766996673).

The spelling of 1211545552 in words is "one billion, two hundred eleven million, five hundred forty-five thousand, five hundred fifty-two".