51864845 has 8 divisors (see below), whose sum is σ = 62279064. Its totient is φ = 41464384.

The previous prime is 51864817. The next prime is 51864871. The reversal of 51864845 is 54846815.

51864845 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 6086089 + 45778756 = 2467^2 + 6766^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51864845 is a prime.

It is a Duffinian number.

It is a congruent 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, 8867 + ... + 13503.

It is an arithmetic number, because the mean of its divisors is an integer number (7784883).

Almost surely, 2^51864845 is an apocalyptic number.

It is an amenable number.

51864845 is a deficient number, since it is larger than the sum of its proper divisors (10414219).

51864845 is a wasteful number, since it uses less digits than its factorization.

51864845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6879.

The product of its digits is 153600, while the sum is 41.

The square root of 51864845 is about 7201.7251405479. The cubic root of 51864845 is about 372.9274584783.

The spelling of 51864845 in words is "fifty-one million, eight hundred sixty-four thousand, eight hundred forty-five".