51540143 has 4 divisors (see below), whose sum is σ = 51886200. Its totient is φ = 51194088.

The previous prime is 51540121. The next prime is 51540161. The reversal of 51540143 is 34104515.

51540143 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51540143 - 2¹² = 51536047 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 (51540193) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 172805 + ... + 173102.

It is an arithmetic number, because the mean of its divisors is an integer number (12971550).

Almost surely, 2^51540143 is an apocalyptic number.

51540143 is a deficient number, since it is larger than the sum of its proper divisors (346057).

51540143 is a wasteful number, since it uses less digits than its factorization.

51540143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346056.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 51540143 is about 7179.1463977272. The cubic root of 51540143 is about 372.1475861574.

Adding to 51540143 its reverse (34104515), we get a palindrome (85644658).

The spelling of 51540143 in words is "fifty-one million, five hundred forty thousand, one hundred forty-three".