520949917 has 2 divisors, whose sum is σ = 520949918. Its totient is φ = 520949916.

The previous prime is 520949909. The next prime is 520949929. The reversal of 520949917 is 719949025.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 367834041 + 153115876 = 19179^2 + 12374^2 .

It is a cyclic number.

It is not a de Polignac number, because 520949917 - 2³ = 520949909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520941917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260474958 + 260474959.

It is an arithmetic number, because the mean of its divisors is an integer number (260474959).

Almost surely, 2^520949917 is an apocalyptic number.

It is an amenable number.

520949917 is a deficient number, since it is larger than the sum of its proper divisors (1).

520949917 is an equidigital number, since it uses as much as digits as its factorization.

520949917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 46.

The square root of 520949917 is about 22824.3273066261. The cubic root of 520949917 is about 804.6345148487.

The spelling of 520949917 in words is "five hundred twenty million, nine hundred forty-nine thousand, nine hundred seventeen".