51503203 has 2 divisors, whose sum is σ = 51503204. Its totient is φ = 51503202.

The previous prime is 51503189. The next prime is 51503209. The reversal of 51503203 is 30230515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51503203 - 2¹³ = 51495011 is a prime.

It is not a weakly prime, because it can be changed into another prime (51503209) 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 as a sum of consecutive naturals, namely, 25751601 + 25751602.

It is an arithmetic number, because the mean of its divisors is an integer number (25751602).

Almost surely, 2^51503203 is an apocalyptic number.

51503203 is a deficient number, since it is larger than the sum of its proper divisors (1).

51503203 is an equidigital number, since it uses as much as digits as its factorization.

51503203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 450, while the sum is 19.

The square root of 51503203 is about 7176.5732073184. The cubic root of 51503203 is about 372.0586560107.

Adding to 51503203 its reverse (30230515), we get a palindrome (81733718).

The spelling of 51503203 in words is "fifty-one million, five hundred three thousand, two hundred three".