520403343989 has 2 divisors, whose sum is σ = 520403343990. Its totient is φ = 520403343988.

The previous prime is 520403343983. The next prime is 520403344003. The reversal of 520403343989 is 989343304025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 284360895025 + 236042448964 = 533255^2 + 485842^2 .

It is a cyclic number.

It is not a de Polignac number, because 520403343989 - 2²⁸ = 520134908533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520403343983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260201671994 + 260201671995.

It is an arithmetic number, because the mean of its divisors is an integer number (260201671995).

Almost surely, 2^520403343989 is an apocalyptic number.

It is an amenable number.

520403343989 is a deficient number, since it is larger than the sum of its proper divisors (1).

520403343989 is an equidigital number, since it uses as much as digits as its factorization.

520403343989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2799360, while the sum is 50.

The spelling of 520403343989 in words is "five hundred twenty billion, four hundred three million, three hundred forty-three thousand, nine hundred eighty-nine".