516239729 has 2 divisors, whose sum is σ = 516239730. Its totient is φ = 516239728.

The previous prime is 516239699. The next prime is 516239741. The reversal of 516239729 is 927932615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 446350129 + 69889600 = 21127^2 + 8360^2 .

It is a cyclic number.

It is not a de Polignac number, because 516239729 - 2⁸ = 516239473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 516239729.

It is not a weakly prime, because it can be changed into another prime (516239029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258119864 + 258119865.

It is an arithmetic number, because the mean of its divisors is an integer number (258119865).

Almost surely, 2^516239729 is an apocalyptic number.

It is an amenable number.

516239729 is a deficient number, since it is larger than the sum of its proper divisors (1).

516239729 is an equidigital number, since it uses as much as digits as its factorization.

516239729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 44.

The square root of 516239729 is about 22720.9095108449. The cubic root of 516239729 is about 802.2021249328.

The spelling of 516239729 in words is "five hundred sixteen million, two hundred thirty-nine thousand, seven hundred twenty-nine".