520011601001 has 4 divisors (see below), whose sum is σ = 521009704404. Its totient is φ = 519013497600.

The previous prime is 520011600959. The next prime is 520011601003. The reversal of 520011601001 is 100106110025.

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

It can be written as a sum of positive squares in 2 ways, for example, as 115739442025 + 404272158976 = 340205^2 + 635824^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520011601001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520011601003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499050920 + ... + 499051961.

It is an arithmetic number, because the mean of its divisors is an integer number (130252426101).

Almost surely, 2^520011601001 is an apocalyptic number.

It is an amenable number.

520011601001 is a deficient number, since it is larger than the sum of its proper divisors (998103403).

520011601001 is an equidigital number, since it uses as much as digits as its factorization.

520011601001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998103402.

The product of its (nonzero) digits is 60, while the sum is 17.

Adding to 520011601001 its reverse (100106110025), we get a palindrome (620117711026).

The spelling of 520011601001 in words is "five hundred twenty billion, eleven million, six hundred one thousand, one".