1115516561 has 8 divisors (see below), whose sum is σ = 1150951200. Its totient is φ = 1080473760.

The previous prime is 1115516531. The next prime is 1115516569. The reversal of 1115516561 is 1656155111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1115516561 - 2⁶ = 1115516497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1115516569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92171 + ... + 103568.

It is an arithmetic number, because the mean of its divisors is an integer number (143868900).

Almost surely, 2^1115516561 is an apocalyptic number.

It is an amenable number.

1115516561 is a deficient number, since it is larger than the sum of its proper divisors (35434639).

1115516561 is a wasteful number, since it uses less digits than its factorization.

1115516561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195919.

The product of its digits is 4500, while the sum is 32.

The square root of 1115516561 is about 33399.3497092384. The cubic root of 1115516561 is about 1037.1112391817. Note that the first 3 decimals are identical.

The spelling of 1115516561 in words is "one billion, one hundred fifteen million, five hundred sixteen thousand, five hundred sixty-one".