521423558849 has 2 divisors, whose sum is σ = 521423558850. Its totient is φ = 521423558848.

The previous prime is 521423558837. The next prime is 521423558863. The reversal of 521423558849 is 948855324125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 510000224449 + 11423334400 = 714143^2 + 106880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521423558849 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 521423558794 and 521423558803.

It is not a weakly prime, because it can be changed into another prime (521423558809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260711779424 + 260711779425.

It is an arithmetic number, because the mean of its divisors is an integer number (260711779425).

Almost surely, 2^521423558849 is an apocalyptic number.

It is an amenable number.

521423558849 is a deficient number, since it is larger than the sum of its proper divisors (1).

521423558849 is an equidigital number, since it uses as much as digits as its factorization.

521423558849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824000, while the sum is 56.

The spelling of 521423558849 in words is "five hundred twenty-one billion, four hundred twenty-three million, five hundred fifty-eight thousand, eight hundred forty-nine".