51312143 has 4 divisors (see below), whose sum is σ = 51330048. Its totient is φ = 51294240.

The previous prime is 51312139. The next prime is 51312167. The reversal of 51312143 is 34121315.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51312143 - 2² = 51312139 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 (51312113) 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, 3578 + ... + 10743.

It is an arithmetic number, because the mean of its divisors is an integer number (12832512).

Almost surely, 2^51312143 is an apocalyptic number.

51312143 is a deficient number, since it is larger than the sum of its proper divisors (17905).

51312143 is a wasteful number, since it uses less digits than its factorization.

51312143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17904.

The product of its digits is 360, while the sum is 20.

The square root of 51312143 is about 7163.2494721320. The cubic root of 51312143 is about 371.5980140467.

Adding to 51312143 its reverse (34121315), we get a palindrome (85433458).

The spelling of 51312143 in words is "fifty-one million, three hundred twelve thousand, one hundred forty-three".