520616881 has 2 divisors, whose sum is σ = 520616882. Its totient is φ = 520616880.

The previous prime is 520616869. The next prime is 520616963. The reversal of 520616881 is 188616025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 431974656 + 88642225 = 20784^2 + 9415^2 .

It is a cyclic number.

It is not a de Polignac number, because 520616881 - 2¹¹ = 520614833 is a prime.

It is a super-2 number, since 2×520616881² = 542083873564336322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 520616881.

It is not a weakly prime, because it can be changed into another prime (520616861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260308440 + 260308441.

It is an arithmetic number, because the mean of its divisors is an integer number (260308441).

Almost surely, 2^520616881 is an apocalyptic number.

It is an amenable number.

520616881 is a deficient number, since it is larger than the sum of its proper divisors (1).

520616881 is an equidigital number, since it uses as much as digits as its factorization.

520616881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 520616881 is about 22817.0305035515. The cubic root of 520616881 is about 804.4630144316.

The spelling of 520616881 in words is "five hundred twenty million, six hundred sixteen thousand, eight hundred eighty-one".