51851143 has 4 divisors (see below), whose sum is σ = 51869560. Its totient is φ = 51832728.

The previous prime is 51851141. The next prime is 51851153. The reversal of 51851143 is 34115815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34115815 = 5 ⋅6823163.

It is a cyclic number.

It is not a de Polignac number, because 51851143 - 2¹ = 51851141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51851141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4005 + ... + 10942.

It is an arithmetic number, because the mean of its divisors is an integer number (12967390).

Almost surely, 2^51851143 is an apocalyptic number.

51851143 is a deficient number, since it is larger than the sum of its proper divisors (18417).

51851143 is a wasteful number, since it uses less digits than its factorization.

51851143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18416.

The product of its digits is 2400, while the sum is 28.

The square root of 51851143 is about 7200.7737778658. The cubic root of 51851143 is about 372.8946147664.

Adding to 51851143 its reverse (34115815), we get a palindrome (85966958).

It can be divided in two parts, 5185 and 1143, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 51851143 in words is "fifty-one million, eight hundred fifty-one thousand, one hundred forty-three".