520331813 has 2 divisors, whose sum is σ = 520331814. Its totient is φ = 520331812.

The previous prime is 520331789. The next prime is 520331837. The reversal of 520331813 is 318133025.

It is a balanced prime because it is at equal distance from previous prime (520331789) and next prime (520331837).

It can be written as a sum of positive squares in only one way, i.e., 457874404 + 62457409 = 21398^2 + 7903^2 .

It is a cyclic number.

It is not a de Polignac number, because 520331813 - 2²² = 516137509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520331843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260165906 + 260165907.

It is an arithmetic number, because the mean of its divisors is an integer number (260165907).

Almost surely, 2^520331813 is an apocalyptic number.

It is an amenable number.

520331813 is a deficient number, since it is larger than the sum of its proper divisors (1).

520331813 is an equidigital number, since it uses as much as digits as its factorization.

520331813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 520331813 is about 22810.7828230423. The cubic root of 520331813 is about 804.3161575392.

Adding to 520331813 its reverse (318133025), we get a palindrome (838464838).

The spelling of 520331813 in words is "five hundred twenty million, three hundred thirty-one thousand, eight hundred thirteen".