1155025520 has 80 divisors (see below), whose sum is σ = 2958239232. Its totient is φ = 415898880.

The previous prime is 1155025513. The next prime is 1155025541. The reversal of 1155025520 is 255205511.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 1155025520.

It is a congruent number.

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, 84269 + ... + 97011.

Almost surely, 2^1155025520 is an apocalyptic number.

1155025520 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 1155025520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1479119616).

1155025520 is an abundant number, since it is smaller than the sum of its proper divisors (1803213712).

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

1155025520 is a wasteful number, since it uses less digits than its factorization.

1155025520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12870 (or 12864 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 1155025520 is about 33985.6663904064. Note that the first 3 decimals coincide. The cubic root of 1155025520 is about 1049.2134759890.

Subtracting from 1155025520 its reverse (255205511), we obtain a square (899820009 = 29997²).

The spelling of 1155025520 in words is "one billion, one hundred fifty-five million, twenty-five thousand, five hundred twenty".