520120621 has 4 divisors (see below), whose sum is σ = 520254432. Its totient is φ = 519986812.

The previous prime is 520120613. The next prime is 520120639. The reversal of 520120621 is 126021025.

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 520120621 - 2³ = 520120613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520120651) 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, 60895 + ... + 68908.

It is an arithmetic number, because the mean of its divisors is an integer number (130063608).

Almost surely, 2^520120621 is an apocalyptic number.

It is an amenable number.

520120621 is a deficient number, since it is larger than the sum of its proper divisors (133811).

520120621 is a wasteful number, since it uses less digits than its factorization.

520120621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133810.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 520120621 is about 22806.1531390105. The cubic root of 520120621 is about 804.2073243418.

Adding to 520120621 its reverse (126021025), we get a palindrome (646141646).

The spelling of 520120621 in words is "five hundred twenty million, one hundred twenty thousand, six hundred twenty-one".