2116581 has 16 divisors (see below), whose sum is σ = 3018240. Its totient is φ = 1315440.

The previous prime is 2116579. The next prime is 2116591. The reversal of 2116581 is 1856112.

It is not a de Polignac number, because 2116581 - 2¹ = 2116579 is a prime.

It is a super-2 number, since 2×2116581² = 8959830259122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2116501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3786 + ... + 4308.

It is an arithmetic number, because the mean of its divisors is an integer number (188640).

2^2116581 is an apocalyptic number.

It is an amenable number.

2116581 is a deficient number, since it is larger than the sum of its proper divisors (901659).

2116581 is a wasteful number, since it uses less digits than its factorization.

2116581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616.

The product of its digits is 480, while the sum is 24.

The square root of 2116581 is about 1454.8474146796. The cubic root of 2116581 is about 128.3940695624.

The spelling of 2116581 in words is "two million, one hundred sixteen thousand, five hundred eighty-one".