2061681 has 8 divisors (see below), whose sum is σ = 2762784. Its totient is φ = 1367520.

The previous prime is 2061679. The next prime is 2061691. The reversal of 2061681 is 1861602.

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

It is not a de Polignac number, because 2061681 - 2¹ = 2061679 is a prime.

It is a super-2 number, since 2×2061681² = 8501057091522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2061601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 996 + ... + 2261.

It is an arithmetic number, because the mean of its divisors is an integer number (345348).

2^2061681 is an apocalyptic number.

It is an amenable number.

2061681 is a deficient number, since it is larger than the sum of its proper divisors (701103).

2061681 is a wasteful number, since it uses less digits than its factorization.

2061681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3471.

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

The square root of 2061681 is about 1435.8554941219. The cubic root of 2061681 is about 127.2742333001.

The spelling of 2061681 in words is "two million, sixty-one thousand, six hundred eighty-one".