51985843 has 32 divisors (see below), whose sum is σ = 68221440. Its totient is φ = 38465280.

The previous prime is 51985837. The next prime is 51985849. The reversal of 51985843 is 34858915.

It is an interprime number because it is at equal distance from previous prime (51985837) and next prime (51985849).

It is not a de Polignac number, because 51985843 - 2⁹ = 51985331 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51985843.

It is not an unprimeable number, because it can be changed into a prime (51985849) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 184863 + ... + 185143.

It is an arithmetic number, because the mean of its divisors is an integer number (2131920).

Almost surely, 2^51985843 is an apocalyptic number.

51985843 is a deficient number, since it is larger than the sum of its proper divisors (16235597).

51985843 is a wasteful number, since it uses less digits than its factorization.

51985843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427.

The product of its digits is 172800, while the sum is 43.

The square root of 51985843 is about 7210.1208727732. The cubic root of 51985843 is about 373.2172400686.

The spelling of 51985843 in words is "fifty-one million, nine hundred eighty-five thousand, eight hundred forty-three".