520113573721 has 27 divisors (see below), whose sum is σ = 608877366591. Its totient is φ = 442994670384.

The previous prime is 520113573709. The next prime is 520113573737. The reversal of 520113573721 is 127375311025.

The square root of 520113573721 is 721189.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 34220930121 + 485892643600 = 184989^2 + 697060^2 .

It is not a de Polignac number, because 520113573721 - 2⁹ = 520113573209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520113573701) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1357998696 + ... + 1357999078.

Almost surely, 2^520113573721 is an apocalyptic number.

520113573721 is the 721189-th square number.

520113573721 is the 360595-th centered octagonal number.

It is an amenable number.

520113573721 is a deficient number, since it is larger than the sum of its proper divisors (88763792870).

520113573721 is an frugal number, since it uses more digits than its factorization.

520113573721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318 (or 659 counting only the distinct ones).

The product of its (nonzero) digits is 44100, while the sum is 37.

Adding to 520113573721 its reverse (127375311025), we get a palindrome (647488884746).

The spelling of 520113573721 in words is "five hundred twenty billion, one hundred thirteen million, five hundred seventy-three thousand, seven hundred twenty-one".