520231643 has 2 divisors, whose sum is σ = 520231644. Its totient is φ = 520231642.

The previous prime is 520231601. The next prime is 520231703. The reversal of 520231643 is 346132025.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 520231643 - 2²⁶ = 453122779 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (520236643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260115821 + 260115822.

It is an arithmetic number, because the mean of its divisors is an integer number (260115822).

Almost surely, 2^520231643 is an apocalyptic number.

520231643 is a deficient number, since it is larger than the sum of its proper divisors (1).

520231643 is an equidigital number, since it uses as much as digits as its factorization.

520231643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 520231643 is about 22808.5870452336. The cubic root of 520231643 is about 804.2645407835.

Adding to 520231643 its reverse (346132025), we get a palindrome (866363668).

The spelling of 520231643 in words is "five hundred twenty million, two hundred thirty-one thousand, six hundred forty-three".