511705451513 has 2 divisors, whose sum is σ = 511705451514. Its totient is φ = 511705451512.

The previous prime is 511705451459. The next prime is 511705451531. The reversal of 511705451513 is 315154507115.

Together with next prime (511705451531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 371401268329 + 140304183184 = 609427^2 + 374572^2 .

It is a cyclic number.

It is not a de Polignac number, because 511705451513 - 2⁶ = 511705451449 is a prime.

It is not a weakly prime, because it can be changed into another prime (511705451813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255852725756 + 255852725757.

It is an arithmetic number, because the mean of its divisors is an integer number (255852725757).

Almost surely, 2^511705451513 is an apocalyptic number.

It is an amenable number.

511705451513 is a deficient number, since it is larger than the sum of its proper divisors (1).

511705451513 is an equidigital number, since it uses as much as digits as its factorization.

511705451513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52500, while the sum is 38.

Adding to 511705451513 its reverse (315154507115), we get a palindrome (826859958628).

The spelling of 511705451513 in words is "five hundred eleven billion, seven hundred five million, four hundred fifty-one thousand, five hundred thirteen".