8916427561 has 4 divisors (see below), whose sum is σ = 9004709124. Its totient is φ = 8828146000.

The previous prime is 8916427543. The next prime is 8916427567. The reversal of 8916427561 is 1657246198.

It is a happy number.

8916427561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1657246198 = 2 ⋅828623099.

It can be written as a sum of positive squares in 2 ways, for example, as 8790000025 + 126427536 = 93755^2 + 11244^2 .

It is a cyclic number.

It is not a de Polignac number, because 8916427561 - 2¹⁷ = 8916296489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8916427567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44140630 + ... + 44140831.

It is an arithmetic number, because the mean of its divisors is an integer number (2251177281).

Almost surely, 2^8916427561 is an apocalyptic number.

It is an amenable number.

8916427561 is a deficient number, since it is larger than the sum of its proper divisors (88281563).

8916427561 is a wasteful number, since it uses less digits than its factorization.

8916427561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88281562.

The product of its digits is 725760, while the sum is 49.

The square root of 8916427561 is about 94426.8370803555. The cubic root of 8916427561 is about 2073.6253583464.

The spelling of 8916427561 in words is "eight billion, nine hundred sixteen million, four hundred twenty-seven thousand, five hundred sixty-one".