1131528528 has 240 divisors, whose sum is σ = 3604380416. Its totient is φ = 341521920.

The previous prime is 1131528523. The next prime is 1131528547. The reversal of 1131528528 is 8258251311.

1131528528 is a `hidden beast` number, since 113 + 15 + 2 + 8 + 528 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1131528492 and 1131528501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131528523) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3083001 + ... + 3083367.

Almost surely, 2^1131528528 is an apocalyptic number.

1131528528 is a gapful number since it is divisible by the number (18) 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 1131528528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1802190208).

1131528528 is an abundant number, since it is smaller than the sum of its proper divisors (2472851888).

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

1131528528 is a wasteful number, since it uses less digits than its factorization.

1131528528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464 (or 446 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 1131528528 is about 33638.2004274902. The cubic root of 1131528528 is about 1042.0498672598.

Adding to 1131528528 its reverse (8258251311), we get a palindrome (9389779839).

The spelling of 1131528528 in words is "one billion, one hundred thirty-one million, five hundred twenty-eight thousand, five hundred twenty-eight".