82644521 has 2 divisors, whose sum is σ = 82644522. Its totient is φ = 82644520.

The previous prime is 82644503. The next prime is 82644533. The reversal of 82644521 is 12544628.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46512400 + 36132121 = 6820^2 + 6011^2 .

It is a cyclic number.

It is not a de Polignac number, because 82644521 - 2¹⁰ = 82643497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (82644721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41322260 + 41322261.

It is an arithmetic number, because the mean of its divisors is an integer number (41322261).

Almost surely, 2^82644521 is an apocalyptic number.

It is an amenable number.

82644521 is a deficient number, since it is larger than the sum of its proper divisors (1).

82644521 is an equidigital number, since it uses as much as digits as its factorization.

82644521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15360, while the sum is 32.

The square root of 82644521 is about 9090.9032004526. The cubic root of 82644521 is about 435.5834352117.

The spelling of 82644521 in words is "eighty-two million, six hundred forty-four thousand, five hundred twenty-one".