51315623 has 2 divisors, whose sum is σ = 51315624. Its totient is φ = 51315622.

The previous prime is 51315613. The next prime is 51315629. The reversal of 51315623 is 32651315.

51315623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51315623 - 2¹⁸ = 51053479 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51315592 and 51315601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51315629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25657811 + 25657812.

It is an arithmetic number, because the mean of its divisors is an integer number (25657812).

Almost surely, 2^51315623 is an apocalyptic number.

51315623 is a deficient number, since it is larger than the sum of its proper divisors (1).

51315623 is an equidigital number, since it uses as much as digits as its factorization.

51315623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 26.

The square root of 51315623 is about 7163.4923745335. The cubic root of 51315623 is about 371.6064144744.

Adding to 51315623 its reverse (32651315), we get a palindrome (83966938).

The spelling of 51315623 in words is "fifty-one million, three hundred fifteen thousand, six hundred twenty-three".