1211136056 has 16 divisors (see below), whose sum is σ = 2445563400. Its totient is φ = 558985824.

The previous prime is 1211136053. The next prime is 1211136061. The reversal of 1211136056 is 6506311121.

It is a super-2 number, since 2×1211136056² = 2933701092286470272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211136053) by changing a digit.

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, 5822666 + ... + 5822873.

Almost surely, 2^1211136056 is an apocalyptic number.

It is an amenable number.

1211136056 is an abundant number, since it is smaller than the sum of its proper divisors (1234427344).

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

1211136056 is a wasteful number, since it uses less digits than its factorization.

1211136056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11645558 (or 11645554 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1211136056 is about 34801.3800875770. The cubic root of 1211136056 is about 1065.9356266135.

Adding to 1211136056 its reverse (6506311121), we get a palindrome (7717447177).

The spelling of 1211136056 in words is "one billion, two hundred eleven million, one hundred thirty-six thousand, fifty-six".