51868505 has 8 divisors (see below), whose sum is σ = 67030152. Its totient is φ = 38302848.

The previous prime is 51868457. The next prime is 51868529. The reversal of 51868505 is 50586815.

It can be written as a sum of positive squares in 4 ways, for example, as 9709456 + 42159049 = 3116^2 + 6493^2 .

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 51868505 - 2⁸ = 51868249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398924 + ... + 399053.

It is an arithmetic number, because the mean of its divisors is an integer number (8378769).

Almost surely, 2^51868505 is an apocalyptic number.

It is an amenable number.

51868505 is a deficient number, since it is larger than the sum of its proper divisors (15161647).

51868505 is a wasteful number, since it uses less digits than its factorization.

51868505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797995.

The product of its (nonzero) digits is 48000, while the sum is 38.

The square root of 51868505 is about 7201.9792418473. The cubic root of 51868505 is about 372.9362305242.

The spelling of 51868505 in words is "fifty-one million, eight hundred sixty-eight thousand, five hundred five".