521161798741 has 2 divisors, whose sum is σ = 521161798742. Its totient is φ = 521161798740.

The previous prime is 521161798739. The next prime is 521161798813. The reversal of 521161798741 is 147897161125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 364441616100 + 156720182641 = 603690^2 + 395879^2 .

It is a cyclic number.

It is not a de Polignac number, because 521161798741 - 2¹ = 521161798739 is a prime.

Together with 521161798739, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521161798711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260580899370 + 260580899371.

It is an arithmetic number, because the mean of its divisors is an integer number (260580899371).

Almost surely, 2^521161798741 is an apocalyptic number.

It is an amenable number.

521161798741 is a deficient number, since it is larger than the sum of its proper divisors (1).

521161798741 is an equidigital number, since it uses as much as digits as its factorization.

521161798741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 52.

The spelling of 521161798741 in words is "five hundred twenty-one billion, one hundred sixty-one million, seven hundred ninety-eight thousand, seven hundred forty-one".