2601681 has 4 divisors (see below), whose sum is σ = 3468912. Its totient is φ = 1734452.

The previous prime is 2601679. The next prime is 2601713. The reversal of 2601681 is 1861062.

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 2601681 - 2¹ = 2601679 is a prime.

It is a super-2 number, since 2×2601681² = 13537488051522, which contains 22 as substring.

It is a D-number.

2601681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2601601) 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, 433611 + ... + 433616.

It is an arithmetic number, because the mean of its divisors is an integer number (867228).

2^2601681 is an apocalyptic number.

It is an amenable number.

2601681 is a deficient number, since it is larger than the sum of its proper divisors (867231).

2601681 is an equidigital number, since it uses as much as digits as its factorization.

2601681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867230.

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

The square root of 2601681 is about 1612.9727214060. The cubic root of 2601681 is about 137.5365148201.

The spelling of 2601681 in words is "two million, six hundred one thousand, six hundred eighty-one".