521442113 has 2 divisors, whose sum is σ = 521442114. Its totient is φ = 521442112.

The previous prime is 521442083. The next prime is 521442151. The reversal of 521442113 is 311244125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518791729 + 2650384 = 22777^2 + 1628^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521442113 is a prime.

It is not a weakly prime, because it can be changed into another prime (521442613) 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, 260721056 + 260721057.

It is an arithmetic number, because the mean of its divisors is an integer number (260721057).

Almost surely, 2^521442113 is an apocalyptic number.

It is an amenable number.

521442113 is a deficient number, since it is larger than the sum of its proper divisors (1).

521442113 is an equidigital number, since it uses as much as digits as its factorization.

521442113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 23.

The square root of 521442113 is about 22835.1070284332. The cubic root of 521442113 is about 804.8878426102.

Adding to 521442113 its reverse (311244125), we get a palindrome (832686238).

The spelling of 521442113 in words is "five hundred twenty-one million, four hundred forty-two thousand, one hundred thirteen".