520383175421 has 2 divisors, whose sum is σ = 520383175422. Its totient is φ = 520383175420.

The previous prime is 520383175399. The next prime is 520383175517. The reversal of 520383175421 is 124571383025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 443038003321 + 77345172100 = 665611^2 + 278110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520383175421 is a prime.

It is a super-2 number, since 2×520383175421² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520383175621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260191587710 + 260191587711.

It is an arithmetic number, because the mean of its divisors is an integer number (260191587711).

Almost surely, 2^520383175421 is an apocalyptic number.

It is an amenable number.

520383175421 is a deficient number, since it is larger than the sum of its proper divisors (1).

520383175421 is an equidigital number, since it uses as much as digits as its factorization.

520383175421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 520383175421 in words is "five hundred twenty billion, three hundred eighty-three million, one hundred seventy-five thousand, four hundred twenty-one".