521326789 has 2 divisors, whose sum is σ = 521326790. Its totient is φ = 521326788.

The previous prime is 521326787. The next prime is 521326829. The reversal of 521326789 is 987623125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 325802500 + 195524289 = 18050^2 + 13983^2 .

It is a cyclic number.

It is not a de Polignac number, because 521326789 - 2¹ = 521326787 is a prime.

Together with 521326787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521326787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260663394 + 260663395.

It is an arithmetic number, because the mean of its divisors is an integer number (260663395).

Almost surely, 2^521326789 is an apocalyptic number.

It is an amenable number.

521326789 is a deficient number, since it is larger than the sum of its proper divisors (1).

521326789 is an equidigital number, since it uses as much as digits as its factorization.

521326789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 43.

The square root of 521326789 is about 22832.5817418881. The cubic root of 521326789 is about 804.8285009453.

The spelling of 521326789 in words is "five hundred twenty-one million, three hundred twenty-six thousand, seven hundred eighty-nine".