2641681 has 16 divisors (see below), whose sum is σ = 3248640. Its totient is φ = 2096640.

The previous prime is 2641669. The next prime is 2641687. The reversal of 2641681 is 1861462.

2641681 = 230² + 231² + ... + 271².

It is not a de Polignac number, because 2641681 - 2⁵ = 2641649 is a prime.

It is a super-2 number, since 2×2641681² = 13956957011522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

Its product of digits (2304) is a multiple of the sum of its prime divisors (384).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2641687) 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, 9261 + ... + 9541.

It is an arithmetic number, because the mean of its divisors is an integer number (203040).

2^2641681 is an apocalyptic number.

It is an amenable number.

2641681 is a deficient number, since it is larger than the sum of its proper divisors (606959).

2641681 is a wasteful number, since it uses less digits than its factorization.

With its successor (2641682) it forms an eRAP, since the sums of their prime factors are consecutive (384 and 385).

2641681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384.

The product of its digits is 2304, while the sum is 28.

The square root of 2641681 is about 1625.3248905988. The cubic root of 2641681 is about 138.2377927739.

The spelling of 2641681 in words is "two million, six hundred forty-one thousand, six hundred eighty-one".