51538243 has 4 divisors (see below), whose sum is σ = 51563520. Its totient is φ = 51512968.

The previous prime is 51538171. The next prime is 51538297. The reversal of 51538243 is 34283515.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51538243 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51538043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9283 + ... + 13756.

It is an arithmetic number, because the mean of its divisors is an integer number (12890880).

Almost surely, 2^51538243 is an apocalyptic number.

51538243 is a deficient number, since it is larger than the sum of its proper divisors (25277).

51538243 is a wasteful number, since it uses less digits than its factorization.

51538243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25276.

The product of its digits is 14400, while the sum is 31.

The square root of 51538243 is about 7179.0140687980. The cubic root of 51538243 is about 372.1430130935.

The spelling of 51538243 in words is "fifty-one million, five hundred thirty-eight thousand, two hundred forty-three".