51603553 has 2 divisors, whose sum is σ = 51603554. Its totient is φ = 51603552.

The previous prime is 51603523. The next prime is 51603571. The reversal of 51603553 is 35530615.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47651409 + 3952144 = 6903^2 + 1988^2 .

It is a cyclic number.

It is not a de Polignac number, because 51603553 - 2⁵ = 51603521 is a prime.

It is not a weakly prime, because it can be changed into another prime (51603523) 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, 25801776 + 25801777.

It is an arithmetic number, because the mean of its divisors is an integer number (25801777).

Almost surely, 2^51603553 is an apocalyptic number.

It is an amenable number.

51603553 is a deficient number, since it is larger than the sum of its proper divisors (1).

51603553 is an equidigital number, since it uses as much as digits as its factorization.

51603553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6750, while the sum is 28.

The square root of 51603553 is about 7183.5613034205. The cubic root of 51603553 is about 372.3001417265.

The spelling of 51603553 in words is "fifty-one million, six hundred three thousand, five hundred fifty-three".