521324452409 has 2 divisors, whose sum is σ = 521324452410. Its totient is φ = 521324452408.

The previous prime is 521324452399. The next prime is 521324452549. The reversal of 521324452409 is 904254423125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 349957431184 + 171367021225 = 591572^2 + 413965^2 .

It is a cyclic number.

It is not a de Polignac number, because 521324452409 - 2¹² = 521324448313 is a prime.

It is not a weakly prime, because it can be changed into another prime (521324452309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260662226204 + 260662226205.

It is an arithmetic number, because the mean of its divisors is an integer number (260662226205).

Almost surely, 2^521324452409 is an apocalyptic number.

It is an amenable number.

521324452409 is a deficient number, since it is larger than the sum of its proper divisors (1).

521324452409 is an equidigital number, since it uses as much as digits as its factorization.

521324452409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 345600, while the sum is 41.

The spelling of 521324452409 in words is "five hundred twenty-one billion, three hundred twenty-four million, four hundred fifty-two thousand, four hundred nine".