521530853 has 2 divisors, whose sum is σ = 521530854. Its totient is φ = 521530852.

The previous prime is 521530831. The next prime is 521530859. The reversal of 521530853 is 358035125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 407959204 + 113571649 = 20198^2 + 10657^2 .

It is a cyclic number.

It is not a de Polignac number, because 521530853 - 2¹⁰ = 521529829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521530859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260765426 + 260765427.

It is an arithmetic number, because the mean of its divisors is an integer number (260765427).

Almost surely, 2^521530853 is an apocalyptic number.

It is an amenable number.

521530853 is a deficient number, since it is larger than the sum of its proper divisors (1).

521530853 is an equidigital number, since it uses as much as digits as its factorization.

521530853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 521530853 is about 22837.0500065135. The cubic root of 521530853 is about 804.9334991296.

Adding to 521530853 its reverse (358035125), we get a palindrome (879565978).

The spelling of 521530853 in words is "five hundred twenty-one million, five hundred thirty thousand, eight hundred fifty-three".