520523351 has 4 divisors (see below), whose sum is σ = 520703400. Its totient is φ = 520343304.

The previous prime is 520523347. The next prime is 520523369. The reversal of 520523351 is 153325025.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 520523351 - 2² = 520523347 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520523351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520523321) 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, 85616 + ... + 91493.

It is an arithmetic number, because the mean of its divisors is an integer number (130175850).

Almost surely, 2^520523351 is an apocalyptic number.

520523351 is a deficient number, since it is larger than the sum of its proper divisors (180049).

520523351 is a wasteful number, since it uses less digits than its factorization.

520523351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180048.

The product of its (nonzero) digits is 4500, while the sum is 26.

The square root of 520523351 is about 22814.9808459267. The cubic root of 520523351 is about 804.4148370132.

Adding to 520523351 its reverse (153325025), we get a palindrome (673848376).

The spelling of 520523351 in words is "five hundred twenty million, five hundred twenty-three thousand, three hundred fifty-one".