51312709 has 8 divisors (see below), whose sum is σ = 59248448. Its totient is φ = 43528320.

The previous prime is 51312707. The next prime is 51312721. The reversal of 51312709 is 90721315.

51312709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51312709 - 2¹ = 51312707 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51312707) 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 7 ways as a sum of consecutive naturals, for example, 37107 + ... + 38464.

It is an arithmetic number, because the mean of its divisors is an integer number (7406056).

Almost surely, 2^51312709 is an apocalyptic number.

It is an amenable number.

51312709 is a deficient number, since it is larger than the sum of its proper divisors (7935739).

51312709 is an equidigital number, since it uses as much as digits as its factorization.

51312709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75675.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 51312709 is about 7163.2889792329. The cubic root of 51312709 is about 371.5993803490.

The spelling of 51312709 in words is "fifty-one million, three hundred twelve thousand, seven hundred nine".