1155012012 has 144 divisors (see below), whose sum is σ = 3757737984. Its totient is φ = 290304000.

The previous prime is 1155011993. The next prime is 1155012013. The reversal of 1155012012 is 2102105511.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1155012013) 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 47 ways as a sum of consecutive naturals, for example, 79212 + ... + 92652.

Almost surely, 2^1155012012 is an apocalyptic number.

1155012012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1155012012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1878868992).

1155012012 is an abundant number, since it is smaller than the sum of its proper divisors (2602725972).

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

1155012012 is a wasteful number, since it uses less digits than its factorization.

1155012012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13500 (or 13495 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 1155012012 is about 33985.4676589862. The cubic root of 1155012012 is about 1049.2093857963.

Adding to 1155012012 its reverse (2102105511), we get a palindrome (3257117523).

The spelling of 1155012012 in words is "one billion, one hundred fifty-five million, twelve thousand, twelve".