51603649 has 2 divisors, whose sum is σ = 51603650. Its totient is φ = 51603648.

The previous prime is 51603613. The next prime is 51603659. The reversal of 51603649 is 94630615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31640625 + 19963024 = 5625^2 + 4468^2 .

It is a cyclic number.

It is not a de Polignac number, because 51603649 - 2⁷ = 51603521 is a prime.

It is not a weakly prime, because it can be changed into another prime (51603659) 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, 25801824 + 25801825.

It is an arithmetic number, because the mean of its divisors is an integer number (25801825).

Almost surely, 2^51603649 is an apocalyptic number.

It is an amenable number.

51603649 is a deficient number, since it is larger than the sum of its proper divisors (1).

51603649 is an equidigital number, since it uses as much as digits as its factorization.

51603649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 51603649 is about 7183.5679853399. The cubic root of 51603649 is about 372.3003725943.

The spelling of 51603649 in words is "fifty-one million, six hundred three thousand, six hundred forty-nine".