2761681 has 4 divisors (see below), whose sum is σ = 2974132. Its totient is φ = 2549232.

The previous prime is 2761657. The next prime is 2761711. The reversal of 2761681 is 1861672.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1113025 + 1648656 = 1055^2 + 1284^2 .

It is a cyclic number.

It is not a de Polignac number, because 2761681 - 2⁷ = 2761553 is a prime.

It is a super-2 number, since 2×2761681² = 15253763891522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2761621) 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, 106206 + ... + 106231.

It is an arithmetic number, because the mean of its divisors is an integer number (743533).

2^2761681 is an apocalyptic number.

It is an amenable number.

2761681 is a deficient number, since it is larger than the sum of its proper divisors (212451).

2761681 is a wasteful number, since it uses less digits than its factorization.

2761681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212450.

The product of its digits is 4032, while the sum is 31.

The square root of 2761681 is about 1661.8306171208. The cubic root of 2761681 is about 140.3000537320.

Subtracting from 2761681 its reverse (1861672), we obtain a palindrome (900009).

The spelling of 2761681 in words is "two million, seven hundred sixty-one thousand, six hundred eighty-one".