2081656 has 8 divisors (see below), whose sum is σ = 3903120. Its totient is φ = 1040824.

The previous prime is 2081647. The next prime is 2081671. The reversal of 2081656 is 6561802.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130096 + ... + 130111.

It is an arithmetic number, because the mean of its divisors is an integer number (487890).

2^2081656 is an apocalyptic number.

It is an amenable number.

2081656 is a deficient number, since it is larger than the sum of its proper divisors (1821464).

2081656 is a wasteful number, since it uses less digits than its factorization.

2081656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260213 (or 260209 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 2081656 is about 1442.7945106632. The cubic root of 2081656 is about 127.6839533599.

It can be divided in two parts, 208165 and 6, that multiplied together give a triangular number (1248990 = T₁₅₈₀).

The spelling of 2081656 in words is "two million, eighty-one thousand, six hundred fifty-six".