511450439989 has 2 divisors, whose sum is σ = 511450439990. Its totient is φ = 511450439988.

The previous prime is 511450439987. The next prime is 511450439999. The reversal of 511450439989 is 989934054115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 364882443025 + 146567996964 = 604055^2 + 382842^2 .

It is a cyclic number.

It is not a de Polignac number, because 511450439989 - 2¹ = 511450439987 is a prime.

Together with 511450439987, 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 (511450439987) 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, 255725219994 + 255725219995.

It is an arithmetic number, because the mean of its divisors is an integer number (255725219995).

Almost surely, 2^511450439989 is an apocalyptic number.

It is an amenable number.

511450439989 is a deficient number, since it is larger than the sum of its proper divisors (1).

511450439989 is an equidigital number, since it uses as much as digits as its factorization.

511450439989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6998400, while the sum is 58.

The spelling of 511450439989 in words is "five hundred eleven billion, four hundred fifty million, four hundred thirty-nine thousand, nine hundred eighty-nine".