51505603 has 2 divisors, whose sum is σ = 51505604. Its totient is φ = 51505602.

The previous prime is 51505549. The next prime is 51505609. The reversal of 51505603 is 30650515.

51505603 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 a de Polignac number, because none of the positive numbers 2^k-51505603 is a prime.

It is not a weakly prime, because it can be changed into another prime (51505609) 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, 25752801 + 25752802.

It is an arithmetic number, because the mean of its divisors is an integer number (25752802).

Almost surely, 2^51505603 is an apocalyptic number.

51505603 is a deficient number, since it is larger than the sum of its proper divisors (1).

51505603 is an equidigital number, since it uses as much as digits as its factorization.

51505603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 51505603 is about 7176.7404160942. The cubic root of 51505603 is about 372.0644351135.

The spelling of 51505603 in words is "fifty-one million, five hundred five thousand, six hundred three".