51115543 has 2 divisors, whose sum is σ = 51115544. Its totient is φ = 51115542.

The previous prime is 51115523. The next prime is 51115577. The reversal of 51115543 is 34551115.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51115543 - 2⁵ = 51115511 is a prime.

It is a super-2 number, since 2×51115543² = 5225597472369698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51115513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25557771 + 25557772.

It is an arithmetic number, because the mean of its divisors is an integer number (25557772).

Almost surely, 2^51115543 is an apocalyptic number.

51115543 is a deficient number, since it is larger than the sum of its proper divisors (1).

51115543 is an equidigital number, since it uses as much as digits as its factorization.

51115543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1500, while the sum is 25.

The square root of 51115543 is about 7149.5134799509. The cubic root of 51115543 is about 371.1228200144.

Adding to 51115543 its reverse (34551115), we get a palindrome (85666658).

The spelling of 51115543 in words is "fifty-one million, one hundred fifteen thousand, five hundred forty-three".