1012155012 has 72 divisors (see below), whose sum is σ = 2815918560. Its totient is φ = 303985920.

The previous prime is 1012155007. The next prime is 1012155019. The reversal of 1012155012 is 2105512101.

1012155012 is a `hidden beast` number, since 101 + 2 + 1 + 550 + 12 = 666.

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 (1012155019) 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 23 ways as a sum of consecutive naturals, for example, 33439 + ... + 56057.

It is an arithmetic number, because the mean of its divisors is an integer number (39109980).

Almost surely, 2^1012155012 is an apocalyptic number.

1012155012 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 1012155012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1407959280).

1012155012 is an abundant number, since it is smaller than the sum of its proper divisors (1803763548).

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

1012155012 is a wasteful number, since it uses less digits than its factorization.

1012155012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22753 (or 22748 counting only the distinct ones).

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

The square root of 1012155012 is about 31814.3837281190. The cubic root of 1012155012 is about 1004.0353645951.

Adding to 1012155012 its reverse (2105512101), we get a palindrome (3117667113).

The spelling of 1012155012 in words is "one billion, twelve million, one hundred fifty-five thousand, twelve".