521356432349 has 2 divisors, whose sum is σ = 521356432350. Its totient is φ = 521356432348.

The previous prime is 521356432297. The next prime is 521356432403. The reversal of 521356432349 is 943234653125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 482911026724 + 38445405625 = 694918^2 + 196075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521356432349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521356432549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260678216174 + 260678216175.

It is an arithmetic number, because the mean of its divisors is an integer number (260678216175).

Almost surely, 2^521356432349 is an apocalyptic number.

It is an amenable number.

521356432349 is a deficient number, since it is larger than the sum of its proper divisors (1).

521356432349 is an equidigital number, since it uses as much as digits as its factorization.

521356432349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2332800, while the sum is 47.

The spelling of 521356432349 in words is "five hundred twenty-one billion, three hundred fifty-six million, four hundred thirty-two thousand, three hundred forty-nine".