1012155520 has 128 divisors (see below), whose sum is σ = 2625663600. Its totient is φ = 371589120.

The previous prime is 1012155511. The next prime is 1012155553. The reversal of 1012155520 is 255512101.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 83612736 + 928542784 = 9144^2 + 30472^2 .

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 1012155491 and 1012155500.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 444946 + ... + 447214.

Almost surely, 2^1012155520 is an apocalyptic number.

1012155520 is a gapful number since it is divisible by the number (10) 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 1012155520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1312831800).

1012155520 is an abundant number, since it is smaller than the sum of its proper divisors (1613508080).

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

1012155520 is a wasteful number, since it uses less digits than its factorization.

1012155520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2346 (or 2334 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 1012155520 is about 31814.3917119281. The cubic root of 1012155520 is about 1004.0355325700.

Adding to 1012155520 its reverse (255512101), we get a palindrome (1267667621).

The spelling of 1012155520 in words is "one billion, twelve million, one hundred fifty-five thousand, five hundred twenty".