1115311560 has 128 divisors (see below), whose sum is σ = 3669494400. Its totient is φ = 268943360.

The previous prime is 1115311559. The next prime is 1115311577. The reversal of 1115311560 is 651135111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1115311560.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 257896 + ... + 262184.

It is an arithmetic number, because the mean of its divisors is an integer number (28667925).

Almost surely, 2^1115311560 is an apocalyptic number.

1115311560 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 1115311560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1834747200).

1115311560 is an abundant number, since it is smaller than the sum of its proper divisors (2554182840).

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

1115311560 is a wasteful number, since it uses less digits than its factorization.

1115311560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4511 (or 4507 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 24.

The square root of 1115311560 is about 33396.2806312320. The cubic root of 1115311560 is about 1037.0477045306.

Adding to 1115311560 its reverse (651135111), we get a palindrome (1766446671).

The spelling of 1115311560 in words is "one billion, one hundred fifteen million, three hundred eleven thousand, five hundred sixty".