51115523 has 2 divisors, whose sum is σ = 51115524. Its totient is φ = 51115522.

The previous prime is 51115513. The next prime is 51115543. The reversal of 51115523 is 32551115.

It is a happy number.

51115523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51115523 - 2¹⁸ = 50853379 is a prime.

It is a super-2 number, since 2×51115523² = 5225593383127058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51115513) 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 as a sum of consecutive naturals, namely, 25557761 + 25557762.

It is an arithmetic number, because the mean of its divisors is an integer number (25557762).

Almost surely, 2^51115523 is an apocalyptic number.

51115523 is a deficient number, since it is larger than the sum of its proper divisors (1).

51115523 is an equidigital number, since it uses as much as digits as its factorization.

51115523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 750, while the sum is 23.

The square root of 51115523 is about 7149.5120812542. The cubic root of 51115523 is about 371.1227716113.

Adding to 51115523 its reverse (32551115), we get a palindrome (83666638).

The spelling of 51115523 in words is "fifty-one million, one hundred fifteen thousand, five hundred twenty-three".