1115110561 has 16 divisors (see below), whose sum is σ = 1166800320. Its totient is φ = 1064963520.

The previous prime is 1115110553. The next prime is 1115110613. The reversal of 1115110561 is 1650115111.

It is a cyclic number.

It is not a de Polignac number, because 1115110561 - 2³ = 1115110553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1115119561) 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, 296851 + ... + 300583.

It is an arithmetic number, because the mean of its divisors is an integer number (72925020).

Almost surely, 2^1115110561 is an apocalyptic number.

It is an amenable number.

1115110561 is a deficient number, since it is larger than the sum of its proper divisors (51689759).

1115110561 is an equidigital number, since it uses as much as digits as its factorization.

1115110561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3936.

The product of its (nonzero) digits is 150, while the sum is 22.

The square root of 1115110561 is about 33393.2711934605. The cubic root of 1115110561 is about 1036.9854026345.

Adding to 1115110561 its reverse (1650115111), we get a palindrome (2765225672).

It can be divided in two parts, 11151 and 10561, that added together give a palindrome (21712).

The spelling of 1115110561 in words is "one billion, one hundred fifteen million, one hundred ten thousand, five hundred sixty-one".