520621042 has 4 divisors (see below), whose sum is σ = 780931566. Its totient is φ = 260310520.

The previous prime is 520621027. The next prime is 520621051. The reversal of 520621042 is 240126025.

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

It can be written as a sum of positive squares in only one way, i.e., 389312361 + 131308681 = 19731^2 + 11459^2 .

It is a super-3 number, since 3×520621042³ (a number of 27 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130155259 + ... + 130155262.

Almost surely, 2^520621042 is an apocalyptic number.

520621042 is a deficient number, since it is larger than the sum of its proper divisors (260310524).

520621042 is a wasteful number, since it uses less digits than its factorization.

520621042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260310523.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 520621042 is about 22817.1216852608. The cubic root of 520621042 is about 804.4651576338.

Adding to 520621042 its reverse (240126025), we get a palindrome (760747067).

The spelling of 520621042 in words is "five hundred twenty million, six hundred twenty-one thousand, forty-two".