520305361 has 4 divisors (see below), whose sum is σ = 520459072. Its totient is φ = 520151652.

The previous prime is 520305353. The next prime is 520305377. The reversal of 520305361 is 163503025.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 520305361 - 2³ = 520305353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520305301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71661 + ... + 78586.

It is an arithmetic number, because the mean of its divisors is an integer number (130114768).

Almost surely, 2^520305361 is an apocalyptic number.

It is an amenable number.

520305361 is a deficient number, since it is larger than the sum of its proper divisors (153711).

520305361 is a wasteful number, since it uses less digits than its factorization.

520305361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153710.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 520305361 is about 22810.2030021655. The cubic root of 520305361 is about 804.3025276905.

Adding to 520305361 its reverse (163503025), we get a palindrome (683808386).

The spelling of 520305361 in words is "five hundred twenty million, three hundred five thousand, three hundred sixty-one".