520341721 has 3 divisors (see below), whose sum is σ = 520364533. Its totient is φ = 520318910.

The previous prime is 520341677. The next prime is 520341769. The reversal of 520341721 is 127143025.

It is a happy number.

The square root of 520341721 is 22811.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 520341721 - 2¹⁹ = 519817433 is a prime.

It is a super-2 number, since 2×520341721² = 541511013226483682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520341781) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 11406 + ... + 34216.

Almost surely, 2^520341721 is an apocalyptic number.

520341721 is the 22811-st square number.

520341721 is the 11406-th centered octagonal number.

It is an amenable number.

520341721 is a deficient number, since it is larger than the sum of its proper divisors (22812).

520341721 is an frugal number, since it uses more digits than its factorization.

520341721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45622 (or 22811 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The cubic root of 520341721 is about 804.3212626879.

Multiplying 520341721 by its sum of digits (25), we get a square (13008543025 = 114055²).

Adding to 520341721 its reverse (127143025), we get a palindrome (647484746).

The spelling of 520341721 in words is "five hundred twenty million, three hundred forty-one thousand, seven hundred twenty-one".