511020565481 has 2 divisors, whose sum is σ = 511020565482. Its totient is φ = 511020565480.

The previous prime is 511020565409. The next prime is 511020565493. The reversal of 511020565481 is 184565020115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 413589185881 + 97431379600 = 643109^2 + 312140^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-511020565481 is a prime.

It is a super-2 number, since 2×511020565481² (a number of 24 digits) contains 22 as substring.

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 (511020565681) 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, 255510282740 + 255510282741.

It is an arithmetic number, because the mean of its divisors is an integer number (255510282741).

Almost surely, 2^511020565481 is an apocalyptic number.

It is an amenable number.

511020565481 is a deficient number, since it is larger than the sum of its proper divisors (1).

511020565481 is an equidigital number, since it uses as much as digits as its factorization.

511020565481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48000, while the sum is 38.

Adding to 511020565481 its reverse (184565020115), we get a palindrome (695585585596).

The spelling of 511020565481 in words is "five hundred eleven billion, twenty million, five hundred sixty-five thousand, four hundred eighty-one".