9118561 has 4 divisors (see below), whose sum is σ = 9134532. Its totient is φ = 9102592.

The previous prime is 9118559. The next prime is 9118573. The reversal of 9118561 is 1658119.

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 8088336 + 1030225 = 2844^2 + 1015^2 .

It is a cyclic number.

It is not a de Polignac number, because 9118561 - 2¹ = 9118559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9118541) 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, 7096 + ... + 8281.

It is an arithmetic number, because the mean of its divisors is an integer number (2283633).

Almost surely, 2^9118561 is an apocalyptic number.

It is an amenable number.

9118561 is a deficient number, since it is larger than the sum of its proper divisors (15971).

9118561 is a wasteful number, since it uses less digits than its factorization.

9118561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15970.

The product of its digits is 2160, while the sum is 31.

The square root of 9118561 is about 3019.6955144517. The cubic root of 9118561 is about 208.9177961709.

The spelling of 9118561 in words is "nine million, one hundred eighteen thousand, five hundred sixty-one".