513520561 has 4 divisors (see below), whose sum is σ = 513676800. Its totient is φ = 513364324.

The previous prime is 513520537. The next prime is 513520621. The reversal of 513520561 is 165025315.

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 513520561 - 2¹³ = 513512369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513550561) 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, 73081 + ... + 79798.

It is an arithmetic number, because the mean of its divisors is an integer number (128419200).

Almost surely, 2^513520561 is an apocalyptic number.

It is an amenable number.

513520561 is a deficient number, since it is larger than the sum of its proper divisors (156239).

513520561 is a wasteful number, since it uses less digits than its factorization.

513520561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156238.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 513520561 is about 22660.9920568363. The cubic root of 513520561 is about 800.7911761466.

Adding to 513520561 its reverse (165025315), we get a palindrome (678545876).

The spelling of 513520561 in words is "five hundred thirteen million, five hundred twenty thousand, five hundred sixty-one".