520040243 has 2 divisors, whose sum is σ = 520040244. Its totient is φ = 520040242.

The previous prime is 520040239. The next prime is 520040299. The reversal of 520040243 is 342040025.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 520040243 - 2² = 520040239 is a prime.

It is not a weakly prime, because it can be changed into another prime (520040233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260020121 + 260020122.

It is an arithmetic number, because the mean of its divisors is an integer number (260020122).

Almost surely, 2^520040243 is an apocalyptic number.

520040243 is a deficient number, since it is larger than the sum of its proper divisors (1).

520040243 is an equidigital number, since it uses as much as digits as its factorization.

520040243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 520040243 is about 22804.3908710581. The cubic root of 520040243 is about 804.1658955502.

Adding to 520040243 its reverse (342040025), we get a palindrome (862080268).

The spelling of 520040243 in words is "five hundred twenty million, forty thousand, two hundred forty-three".