51200521 has 4 divisors (see below), whose sum is σ = 51901972. Its totient is φ = 50499072.

The previous prime is 51200519. The next prime is 51200557. The reversal of 51200521 is 12500215.

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 40144896 + 11055625 = 6336^2 + 3325^2 .

It is a cyclic number.

It is not a de Polignac number, because 51200521 - 2¹ = 51200519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51200495 and 51200504.

It is not an unprimeable number, because it can be changed into a prime (51200581) 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, 350616 + ... + 350761.

It is an arithmetic number, because the mean of its divisors is an integer number (12975493).

Almost surely, 2^51200521 is an apocalyptic number.

It is an amenable number.

51200521 is a deficient number, since it is larger than the sum of its proper divisors (701451).

51200521 is an equidigital number, since it uses as much as digits as its factorization.

51200521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701450.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 51200521 is about 7155.4539338885. The cubic root of 51200521 is about 371.3283661992.

Adding to 51200521 its reverse (12500215), we get a palindrome (63700736).

The spelling of 51200521 in words is "fifty-one million, two hundred thousand, five hundred twenty-one".