51291543 has 4 divisors (see below), whose sum is σ = 68388728. Its totient is φ = 34194360.

The previous prime is 51291503. The next prime is 51291547. The reversal of 51291543 is 34519215.

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

It is not a de Polignac number, because 51291543 - 2¹⁷ = 51160471 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 51291543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51291547) 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, 8548588 + ... + 8548593.

It is an arithmetic number, because the mean of its divisors is an integer number (17097182).

Almost surely, 2^51291543 is an apocalyptic number.

51291543 is a deficient number, since it is larger than the sum of its proper divisors (17097185).

51291543 is a wasteful number, since it uses less digits than its factorization.

51291543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17097184.

The product of its digits is 5400, while the sum is 30.

The square root of 51291543 is about 7161.8114328709. The cubic root of 51291543 is about 371.5482795961.

The spelling of 51291543 in words is "fifty-one million, two hundred ninety-one thousand, five hundred forty-three".