521326919 has 2 divisors, whose sum is σ = 521326920. Its totient is φ = 521326918.

The previous prime is 521326903. The next prime is 521326937. The reversal of 521326919 is 919623125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521326919 - 2⁴ = 521326903 is a prime.

It is a super-2 number, since 2×521326919² = 543563512948065122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521326979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260663459 + 260663460.

It is an arithmetic number, because the mean of its divisors is an integer number (260663460).

Almost surely, 2^521326919 is an apocalyptic number.

521326919 is a deficient number, since it is larger than the sum of its proper divisors (1).

521326919 is an equidigital number, since it uses as much as digits as its factorization.

521326919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 38.

The square root of 521326919 is about 22832.5845886969. The cubic root of 521326919 is about 804.8285678436.

The spelling of 521326919 in words is "five hundred twenty-one million, three hundred twenty-six thousand, nine hundred nineteen".