511125206261 has 2 divisors, whose sum is σ = 511125206262. Its totient is φ = 511125206260.

The previous prime is 511125206239. The next prime is 511125206279. The reversal of 511125206261 is 162602521115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 281271122500 + 229854083761 = 530350^2 + 479431^2 .

It is a cyclic number.

It is not a de Polignac number, because 511125206261 - 2⁶ = 511125206197 is a prime.

It is a super-2 number, since 2×511125206261² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (511125236261) 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, 255562603130 + 255562603131.

It is an arithmetic number, because the mean of its divisors is an integer number (255562603131).

Almost surely, 2^511125206261 is an apocalyptic number.

It is an amenable number.

511125206261 is a deficient number, since it is larger than the sum of its proper divisors (1).

511125206261 is an equidigital number, since it uses as much as digits as its factorization.

511125206261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 32.

Adding to 511125206261 its reverse (162602521115), we get a palindrome (673727727376).

The spelling of 511125206261 in words is "five hundred eleven billion, one hundred twenty-five million, two hundred six thousand, two hundred sixty-one".