1115725661 has 4 divisors (see below), whose sum is σ = 1142938524. Its totient is φ = 1088512800.

The previous prime is 1115725603. The next prime is 1115725669. The reversal of 1115725661 is 1665275111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 130393561 + 985332100 = 11419^2 + 31390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1115725661 is a prime.

It is a super-2 number, since 2×1115725661² = 2489687501227773842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115725669) 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, 13606370 + ... + 13606451.

It is an arithmetic number, because the mean of its divisors is an integer number (285734631).

Almost surely, 2^1115725661 is an apocalyptic number.

It is an amenable number.

1115725661 is a deficient number, since it is larger than the sum of its proper divisors (27212863).

1115725661 is an equidigital number, since it uses as much as digits as its factorization.

1115725661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27212862.

The product of its digits is 12600, while the sum is 35.

The square root of 1115725661 is about 33402.4798630281. The cubic root of 1115725661 is about 1037.1760361912.

The spelling of 1115725661 in words is "one billion, one hundred fifteen million, seven hundred twenty-five thousand, six hundred sixty-one".