522891521 has 2 divisors, whose sum is σ = 522891522. Its totient is φ = 522891520.

The previous prime is 522891503. The next prime is 522891541. The reversal of 522891521 is 125198225.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 444745921 + 78145600 = 21089^2 + 8840^2 .

It is a cyclic number.

It is not a de Polignac number, because 522891521 - 2¹⁰ = 522890497 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 (522891541) 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, 261445760 + 261445761.

It is an arithmetic number, because the mean of its divisors is an integer number (261445761).

Almost surely, 2^522891521 is an apocalyptic number.

It is an amenable number.

522891521 is a deficient number, since it is larger than the sum of its proper divisors (1).

522891521 is an equidigital number, since it uses as much as digits as its factorization.

522891521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 35.

The square root of 522891521 is about 22866.8214013229. The cubic root of 522891521 is about 805.6329119770.

The spelling of 522891521 in words is "five hundred twenty-two million, eight hundred ninety-one thousand, five hundred twenty-one".