2016581 has 8 divisors (see below), whose sum is σ = 2379264. Its totient is φ = 1672560.

The previous prime is 2016577. The next prime is 2016583. The reversal of 2016581 is 1856102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2016581 - 2² = 2016577 is a prime.

It is a super-2 number, since 2×2016581² = 8133197859122, 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 (2016583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4430 + ... + 4863.

It is an arithmetic number, because the mean of its divisors is an integer number (297408).

2^2016581 is an apocalyptic number.

It is an amenable number.

2016581 is a deficient number, since it is larger than the sum of its proper divisors (362683).

2016581 is an equidigital number, since it uses as much as digits as its factorization.

2016581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9331.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 2016581 is about 1420.0637309642. The cubic root of 2016581 is about 126.3393263858.

The spelling of 2016581 in words is "two million, sixteen thousand, five hundred eighty-one".