520019993 has 2 divisors, whose sum is σ = 520019994. Its totient is φ = 520019992.

The previous prime is 520019977. The next prime is 520020001. The reversal of 520019993 is 399910025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 299705344 + 220314649 = 17312^2 + 14843^2 .

It is a cyclic number.

It is not a de Polignac number, because 520019993 - 2⁴ = 520019977 is a prime.

It is not a weakly prime, because it can be changed into another prime (520019963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260009996 + 260009997.

It is an arithmetic number, because the mean of its divisors is an integer number (260009997).

Almost surely, 2^520019993 is an apocalyptic number.

It is an amenable number.

520019993 is a deficient number, since it is larger than the sum of its proper divisors (1).

520019993 is an equidigital number, since it uses as much as digits as its factorization.

520019993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 38.

The square root of 520019993 is about 22803.9468732937. The cubic root of 520019993 is about 804.1554575306.

The spelling of 520019993 in words is "five hundred twenty million, nineteen thousand, nine hundred ninety-three".