51916505 has 8 divisors (see below), whose sum is σ = 63153672. Its totient is φ = 40963968.

The previous prime is 51916477. The next prime is 51916511. The reversal of 51916505 is 50561915.

51916505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 12138256 + 39778249 = 3484^2 + 6307^2 .

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 51916505 - 2⁶ = 51916441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 70754 + ... + 71483.

It is an arithmetic number, because the mean of its divisors is an integer number (7894209).

Almost surely, 2^51916505 is an apocalyptic number.

It is an amenable number.

51916505 is a deficient number, since it is larger than the sum of its proper divisors (11237167).

51916505 is a wasteful number, since it uses less digits than its factorization.

51916505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142315.

The product of its (nonzero) digits is 6750, while the sum is 32.

The square root of 51916505 is about 7205.3108885044. The cubic root of 51916505 is about 373.0512355737.

The spelling of 51916505 in words is "fifty-one million, nine hundred sixteen thousand, five hundred five".