511814231681 has 2 divisors, whose sum is σ = 511814231682. Its totient is φ = 511814231680.

The previous prime is 511814231623. The next prime is 511814231689. The reversal of 511814231681 is 186132418115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 275415040000 + 236399191681 = 524800^2 + 486209^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-511814231681 is a prime.

It is a super-2 number, since 2×511814231681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (511814231689) 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, 255907115840 + 255907115841.

It is an arithmetic number, because the mean of its divisors is an integer number (255907115841).

Almost surely, 2^511814231681 is an apocalyptic number.

It is an amenable number.

511814231681 is a deficient number, since it is larger than the sum of its proper divisors (1).

511814231681 is an equidigital number, since it uses as much as digits as its factorization.

511814231681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46080, while the sum is 41.

Adding to 511814231681 its reverse (186132418115), we get a palindrome (697946649796).

The spelling of 511814231681 in words is "five hundred eleven billion, eight hundred fourteen million, two hundred thirty-one thousand, six hundred eighty-one".