520640611 has 4 divisors (see below), whose sum is σ = 521262000. Its totient is φ = 520019224.

The previous prime is 520640587. The next prime is 520640621. The reversal of 520640611 is 116046025.

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 520640611 - 2¹¹ = 520638563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520640621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309436 + ... + 311113.

It is an arithmetic number, because the mean of its divisors is an integer number (130315500).

Almost surely, 2^520640611 is an apocalyptic number.

520640611 is a deficient number, since it is larger than the sum of its proper divisors (621389).

520640611 is an equidigital number, since it uses as much as digits as its factorization.

520640611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621388.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 520640611 is about 22817.5505039432. The cubic root of 520640611 is about 804.4752368662.

Adding to 520640611 its reverse (116046025), we get a palindrome (636686636).

The spelling of 520640611 in words is "five hundred twenty million, six hundred forty thousand, six hundred eleven".