9116581 has 4 divisors (see below), whose sum is σ = 9169452. Its totient is φ = 9063712.

The previous prime is 9116557. The next prime is 9116587. The reversal of 9116581 is 1856119.

9116581 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.

It can be written as a sum of positive squares in 2 ways, for example, as 8673025 + 443556 = 2945^2 + 666^2 .

It is a cyclic number.

It is not a de Polignac number, because 9116581 - 2¹⁵ = 9083813 is a prime.

It is a super-2 number, since 2×9116581² = 166224098259122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9116587) 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, 26176 + ... + 26521.

It is an arithmetic number, because the mean of its divisors is an integer number (2292363).

Almost surely, 2^9116581 is an apocalyptic number.

It is an amenable number.

9116581 is a deficient number, since it is larger than the sum of its proper divisors (52871).

9116581 is a wasteful number, since it uses less digits than its factorization.

9116581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52870.

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

The square root of 9116581 is about 3019.3676490285. The cubic root of 9116581 is about 208.9026736393.

The spelling of 9116581 in words is "nine million, one hundred sixteen thousand, five hundred eighty-one".