51336521 has 4 divisors (see below), whose sum is σ = 51536532. Its totient is φ = 51136512.

The previous prime is 51336517. The next prime is 51336553. The reversal of 51336521 is 12563315.

51336521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 44890000 + 6446521 = 6700^2 + 2539^2 .

It is a cyclic number.

It is not a de Polignac number, because 51336521 - 2² = 51336517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51336581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99620 + ... + 100133.

It is an arithmetic number, because the mean of its divisors is an integer number (12884133).

Almost surely, 2^51336521 is an apocalyptic number.

It is an amenable number.

51336521 is a deficient number, since it is larger than the sum of its proper divisors (200011).

51336521 is a wasteful number, since it uses less digits than its factorization.

51336521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200010.

The product of its digits is 2700, while the sum is 26.

The square root of 51336521 is about 7164.9508721275. The cubic root of 51336521 is about 371.6568525051.

Adding to 51336521 its reverse (12563315), we get a palindrome (63899836).

The spelling of 51336521 in words is "fifty-one million, three hundred thirty-six thousand, five hundred twenty-one".