51330513 has 16 divisors (see below), whose sum is σ = 76084736. Its totient is φ = 30568320.

The previous prime is 51330511. The next prime is 51330527. The reversal of 51330513 is 31503315.

It is a happy number.

It is not a de Polignac number, because 51330513 - 2¹ = 51330511 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51330513.

It is not an unprimeable number, because it can be changed into a prime (51330511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20020 + ... + 22437.

It is an arithmetic number, because the mean of its divisors is an integer number (4755296).

Almost surely, 2^51330513 is an apocalyptic number.

It is an amenable number.

51330513 is a deficient number, since it is larger than the sum of its proper divisors (24754223).

51330513 is a wasteful number, since it uses less digits than its factorization.

51330513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42504.

The product of its (nonzero) digits is 675, while the sum is 21.

The square root of 51330513 is about 7164.5315966921. The cubic root of 51330513 is about 371.6423533958.

Adding to 51330513 its reverse (31503315), we get a palindrome (82833828).

The spelling of 51330513 in words is "fifty-one million, three hundred thirty thousand, five hundred thirteen".