520012008409 has 2 divisors, whose sum is σ = 520012008410. Its totient is φ = 520012008408.

The previous prime is 520012008391. The next prime is 520012008413. The reversal of 520012008409 is 904800210025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 519304714384 + 707294025 = 720628^2 + 26595^2 .

It is a cyclic number.

It is not a de Polignac number, because 520012008409 - 2¹¹ = 520012006361 is a prime.

It is a super-2 number, since 2×520012008409² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (520012008449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260006004204 + 260006004205.

It is an arithmetic number, because the mean of its divisors is an integer number (260006004205).

Almost surely, 2^520012008409 is an apocalyptic number.

It is an amenable number.

520012008409 is a deficient number, since it is larger than the sum of its proper divisors (1).

520012008409 is an equidigital number, since it uses as much as digits as its factorization.

520012008409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The spelling of 520012008409 in words is "five hundred twenty billion, twelve million, eight thousand, four hundred nine".