51543543 has 4 divisors (see below), whose sum is σ = 68724728. Its totient is φ = 34362360.

The previous prime is 51543539. The next prime is 51543559. The reversal of 51543543 is 34534515.

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

It is not a de Polignac number, because 51543543 - 2² = 51543539 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51543543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51543533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8590588 + ... + 8590593.

It is an arithmetic number, because the mean of its divisors is an integer number (17181182).

Almost surely, 2^51543543 is an apocalyptic number.

51543543 is a deficient number, since it is larger than the sum of its proper divisors (17181185).

51543543 is a wasteful number, since it uses less digits than its factorization.

51543543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17181184.

The product of its digits is 18000, while the sum is 30.

The square root of 51543543 is about 7179.3831907762. The cubic root of 51543543 is about 372.1557692545.

Subtracting from 51543543 its reverse (34534515), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 51543543 in words is "fifty-one million, five hundred forty-three thousand, five hundred forty-three".