2016681 has 4 divisors (see below), whose sum is σ = 2688912. Its totient is φ = 1344452.

The previous prime is 2016673. The next prime is 2016691. The reversal of 2016681 is 1866102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2016681 - 2³ = 2016673 is a prime.

It is a super-2 number, since 2×2016681² = 8134004511522, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (2016671) 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, 336111 + ... + 336116.

It is an arithmetic number, because the mean of its divisors is an integer number (672228).

2^2016681 is an apocalyptic number.

It is an amenable number.

2016681 is a deficient number, since it is larger than the sum of its proper divisors (672231).

2016681 is an equidigital number, since it uses as much as digits as its factorization.

2016681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672230.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 2016681 is about 1420.0989402151. The cubic root of 2016681 is about 126.3414146933.

The spelling of 2016681 in words is "two million, sixteen thousand, six hundred eighty-one".