2756521 has 2 divisors, whose sum is σ = 2756522. Its totient is φ = 2756520.

The previous prime is 2756519. The next prime is 2756549. The reversal of 2756521 is 1256572.

2756521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (2756549) can be obtained adding 2756521 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1590121 + 1166400 = 1261^2 + 1080^2 .

It is a cyclic number.

It is not a de Polignac number, because 2756521 - 2¹ = 2756519 is a prime.

Together with 2756519, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2756521.

It is not a weakly prime, because it can be changed into another prime (2756561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1378260 + 1378261.

It is an arithmetic number, because the mean of its divisors is an integer number (1378261).

2^2756521 is an apocalyptic number.

It is an amenable number.

2756521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2756521 is an equidigital number, since it uses as much as digits as its factorization.

2756521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4200, while the sum is 28.

The square root of 2756521 is about 1660.2773864629. The cubic root of 2756521 is about 140.2126191071.

It can be divided in two parts, 275652 and 1, that added together give a triangular number (275653 = T₇₄₂).

The spelling of 2756521 in words is "two million, seven hundred fifty-six thousand, five hundred twenty-one".