516556121 has 2 divisors, whose sum is σ = 516556122. Its totient is φ = 516556120.

The previous prime is 516556111. The next prime is 516556129. The reversal of 516556121 is 121655615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 447914896 + 68641225 = 21164^2 + 8285^2 .

It is a cyclic number.

It is not a de Polignac number, because 516556121 - 2¹⁰ = 516555097 is a prime.

It is a super-2 number, since 2×516556121² = 533660452285133282, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (516556129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258278060 + 258278061.

It is an arithmetic number, because the mean of its divisors is an integer number (258278061).

Almost surely, 2^516556121 is an apocalyptic number.

It is an amenable number.

516556121 is a deficient number, since it is larger than the sum of its proper divisors (1).

516556121 is an equidigital number, since it uses as much as digits as its factorization.

516556121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000, while the sum is 32.

The square root of 516556121 is about 22727.8710177614. The cubic root of 516556121 is about 802.3659754894.

The spelling of 516556121 in words is "five hundred sixteen million, five hundred fifty-six thousand, one hundred twenty-one".