1115601601 has 4 divisors (see below), whose sum is σ = 1115674452. Its totient is φ = 1115528752.

The previous prime is 1115601533. The next prime is 1115601607. The reversal of 1115601601 is 1061065111.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 891321025 + 224280576 = 29855^2 + 14976^2 .

It is a cyclic number.

It is not a de Polignac number, because 1115601601 - 2⁹ = 1115601089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1115601607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3586 + ... + 47371.

It is an arithmetic number, because the mean of its divisors is an integer number (278918613).

Almost surely, 2^1115601601 is an apocalyptic number.

It is an amenable number.

1115601601 is a deficient number, since it is larger than the sum of its proper divisors (72851).

1115601601 is an equidigital number, since it uses as much as digits as its factorization.

1115601601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72850.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 1115601601 is about 33400.6227636552. The cubic root of 1115601601 is about 1037.1375928017.

Adding to 1115601601 its reverse (1061065111), we get a palindrome (2176666712).

The spelling of 1115601601 in words is "one billion, one hundred fifteen million, six hundred one thousand, six hundred one".