51330709 has 4 divisors (see below), whose sum is σ = 51368800. Its totient is φ = 51292620.

The previous prime is 51330683. The next prime is 51330739. The reversal of 51330709 is 90703315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51330709 - 2⁹ = 51330197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51330739) 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, 16947 + ... + 19744.

It is an arithmetic number, because the mean of its divisors is an integer number (12842200).

Almost surely, 2^51330709 is an apocalyptic number.

It is an amenable number.

51330709 is a deficient number, since it is larger than the sum of its proper divisors (38091).

51330709 is a wasteful number, since it uses less digits than its factorization.

51330709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38090.

The product of its (nonzero) digits is 2835, while the sum is 28.

The square root of 51330709 is about 7164.5452751727. The cubic root of 51330709 is about 371.6428264205.

The spelling of 51330709 in words is "fifty-one million, three hundred thirty thousand, seven hundred nine".