1131005560 has 64 divisors (see below), whose sum is σ = 2590963200. Its totient is φ = 444233856.

The previous prime is 1131005543. The next prime is 1131005567. The reversal of 1131005560 is 655001311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131005567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1347621 + ... + 1348459.

It is an arithmetic number, because the mean of its divisors is an integer number (40483800).

Almost surely, 2^1131005560 is an apocalyptic number.

1131005560 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 1131005560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1295481600).

1131005560 is an abundant number, since it is smaller than the sum of its proper divisors (1459957640).

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

1131005560 is a wasteful number, since it uses less digits than its factorization.

1131005560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420 (or 1416 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 1131005560 is about 33630.4261049425. The cubic root of 1131005560 is about 1041.8893048880.

Adding to 1131005560 its reverse (655001311), we get a palindrome (1786006871).

The spelling of 1131005560 in words is "one billion, one hundred thirty-one million, five thousand, five hundred sixty".