520353917 has 2 divisors, whose sum is σ = 520353918. Its totient is φ = 520353916.

The previous prime is 520353887. The next prime is 520353929. The reversal of 520353917 is 719353025.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 513520921 + 6832996 = 22661^2 + 2614^2 .

It is a cyclic number.

It is not a de Polignac number, because 520353917 - 2⁸ = 520353661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520353937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260176958 + 260176959.

It is an arithmetic number, because the mean of its divisors is an integer number (260176959).

Almost surely, 2^520353917 is an apocalyptic number.

It is an amenable number.

520353917 is a deficient number, since it is larger than the sum of its proper divisors (1).

520353917 is an equidigital number, since it uses as much as digits as its factorization.

520353917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28350, while the sum is 35.

The square root of 520353917 is about 22811.2673256003. The cubic root of 520353917 is about 804.3275466516.

The spelling of 520353917 in words is "five hundred twenty million, three hundred fifty-three thousand, nine hundred seventeen".