2756681 has 2 divisors, whose sum is σ = 2756682. Its totient is φ = 2756680.

The previous prime is 2756671. The next prime is 2756683. The reversal of 2756681 is 1866572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2689600 + 67081 = 1640^2 + 259^2 .

It is a cyclic number.

It is not a de Polignac number, because 2756681 - 2¹⁸ = 2494537 is a prime.

It is a super-2 number, since 2×2756681² = 15198580271522, which contains 22 as substring.

Together with 2756683, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2756683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1378340 + 1378341.

It is an arithmetic number, because the mean of its divisors is an integer number (1378341).

2^2756681 is an apocalyptic number.

It is an amenable number.

2756681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2756681 is an equidigital number, since it uses as much as digits as its factorization.

2756681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The square root of 2756681 is about 1660.3255704831. The cubic root of 2756681 is about 140.2153318967.

The spelling of 2756681 in words is "two million, seven hundred fifty-six thousand, six hundred eighty-one".