516555121 has 2 divisors, whose sum is σ = 516555122. Its totient is φ = 516555120.

The previous prime is 516555103. The next prime is 516555133. The reversal of 516555121 is 121555615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 428945521 + 87609600 = 20711^2 + 9360^2 .

It is a cyclic number.

It is not a de Polignac number, because 516555121 - 2⁹ = 516554609 is a prime.

It is not a weakly prime, because it can be changed into another prime (516555181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258277560 + 258277561.

It is an arithmetic number, because the mean of its divisors is an integer number (258277561).

Almost surely, 2^516555121 is an apocalyptic number.

It is an amenable number.

516555121 is a deficient number, since it is larger than the sum of its proper divisors (1).

516555121 is an equidigital number, since it uses as much as digits as its factorization.

516555121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7500, while the sum is 31.

The square root of 516555121 is about 22727.8490183299. The cubic root of 516555121 is about 802.3654577228.

The spelling of 516555121 in words is "five hundred sixteen million, five hundred fifty-five thousand, one hundred twenty-one".