512805121 has 2 divisors, whose sum is σ = 512805122. Its totient is φ = 512805120.

The previous prime is 512805113. The next prime is 512805127. The reversal of 512805121 is 121508215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 335622400 + 177182721 = 18320^2 + 13311^2 .

It is a cyclic number.

It is not a de Polignac number, because 512805121 - 2³ = 512805113 is a prime.

It is not a weakly prime, because it can be changed into another prime (512805127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256402560 + 256402561.

It is an arithmetic number, because the mean of its divisors is an integer number (256402561).

Almost surely, 2^512805121 is an apocalyptic number.

It is an amenable number.

512805121 is a deficient number, since it is larger than the sum of its proper divisors (1).

512805121 is an equidigital number, since it uses as much as digits as its factorization.

512805121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 512805121 is about 22645.2008381467. The cubic root of 512805121 is about 800.4191142449.

The spelling of 512805121 in words is "five hundred twelve million, eight hundred five thousand, one hundred twenty-one".