2066521 has 2 divisors, whose sum is σ = 2066522. Its totient is φ = 2066520.

The previous prime is 2066509. The next prime is 2066539. The reversal of 2066521 is 1256602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1625625 + 440896 = 1275^2 + 664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2066521 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2066492 and 2066501.

It is not a weakly prime, because it can be changed into another prime (2066501) 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, 1033260 + 1033261.

It is an arithmetic number, because the mean of its divisors is an integer number (1033261).

2^2066521 is an apocalyptic number.

It is an amenable number.

2066521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2066521 is an equidigital number, since it uses as much as digits as its factorization.

2066521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 2066521 is about 1437.5399124894. The cubic root of 2066521 is about 127.3737517465.

The spelling of 2066521 in words is "two million, sixty-six thousand, five hundred twenty-one".