516666121 has 2 divisors, whose sum is σ = 516666122. Its totient is φ = 516666120.

The previous prime is 516666109. The next prime is 516666149. The reversal of 516666121 is 121666615.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 313290000 + 203376121 = 17700^2 + 14261^2 .

It is a cyclic number.

It is not a de Polignac number, because 516666121 - 2²³ = 508277513 is a prime.

It is not a weakly prime, because it can be changed into another prime (516666151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258333060 + 258333061.

It is an arithmetic number, because the mean of its divisors is an integer number (258333061).

Almost surely, 2^516666121 is an apocalyptic number.

It is an amenable number.

516666121 is a deficient number, since it is larger than the sum of its proper divisors (1).

516666121 is an equidigital number, since it uses as much as digits as its factorization.

516666121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 34.

The square root of 516666121 is about 22730.2908252402. The cubic root of 516666121 is about 802.4229257345.

The spelling of 516666121 in words is "five hundred sixteen million, six hundred sixty-six thousand, one hundred twenty-one".