520311641 has 4 divisors (see below), whose sum is σ = 520693632. Its totient is φ = 519929652.

The previous prime is 520311629. The next prime is 520311679. The reversal of 520311641 is 146113025.

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 a de Polignac number, because none of the positive numbers 2^k-520311641 is a prime.

It is a super-2 number, since 2×520311641² = 541448407520225762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520311691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188945 + ... + 191678.

It is an arithmetic number, because the mean of its divisors is an integer number (130173408).

Almost surely, 2^520311641 is an apocalyptic number.

It is an amenable number.

520311641 is a deficient number, since it is larger than the sum of its proper divisors (381991).

520311641 is a wasteful number, since it uses less digits than its factorization.

520311641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381990.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 520311641 is about 22810.3406594465. The cubic root of 520311641 is about 804.3057636105.

Adding to 520311641 its reverse (146113025), we get a palindrome (666424666).

The spelling of 520311641 in words is "five hundred twenty million, three hundred eleven thousand, six hundred forty-one".