516523504121 has 2 divisors, whose sum is σ = 516523504122. Its totient is φ = 516523504120.

The previous prime is 516523504103. The next prime is 516523504141. The reversal of 516523504121 is 121405325615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 273592809721 + 242930694400 = 523061^2 + 492880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-516523504121 is a prime.

It is not a weakly prime, because it can be changed into another prime (516523504141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258261752060 + 258261752061.

It is an arithmetic number, because the mean of its divisors is an integer number (258261752061).

Almost surely, 2^516523504121 is an apocalyptic number.

It is an amenable number.

516523504121 is a deficient number, since it is larger than the sum of its proper divisors (1).

516523504121 is an equidigital number, since it uses as much as digits as its factorization.

516523504121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 35.

Adding to 516523504121 its reverse (121405325615), we get a palindrome (637928829736).

The spelling of 516523504121 in words is "five hundred sixteen billion, five hundred twenty-three million, five hundred four thousand, one hundred twenty-one".