52051302521 has 4 divisors (see below), whose sum is σ = 52081549044. Its totient is φ = 52021056000.

The previous prime is 52051302509. The next prime is 52051302577. The reversal of 52051302521 is 12520315025.

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 31676880400 + 20374422121 = 177980^2 + 142739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52051302521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (52051332521) 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, 15120680 + ... + 15124121.

It is an arithmetic number, because the mean of its divisors is an integer number (13020387261).

Almost surely, 2^52051302521 is an apocalyptic number.

It is an amenable number.

52051302521 is a deficient number, since it is larger than the sum of its proper divisors (30246523).

52051302521 is a wasteful number, since it uses less digits than its factorization.

52051302521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30246522.

The product of its (nonzero) digits is 3000, while the sum is 26.

Adding to 52051302521 its reverse (12520315025), we get a palindrome (64571617546).

The spelling of 52051302521 in words is "fifty-two billion, fifty-one million, three hundred two thousand, five hundred twenty-one".