51505549 has 2 divisors, whose sum is σ = 51505550. Its totient is φ = 51505548.

The previous prime is 51505547. The next prime is 51505603. The reversal of 51505549 is 94550515.

51505549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35784324 + 15721225 = 5982^2 + 3965^2 .

It is a cyclic number.

It is not a de Polignac number, because 51505549 - 2¹ = 51505547 is a prime.

Together with 51505547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51505543) 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, 25752774 + 25752775.

It is an arithmetic number, because the mean of its divisors is an integer number (25752775).

Almost surely, 2^51505549 is an apocalyptic number.

It is an amenable number.

51505549 is a deficient number, since it is larger than the sum of its proper divisors (1).

51505549 is an equidigital number, since it uses as much as digits as its factorization.

51505549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 51505549 is about 7176.7366539396. The cubic root of 51505549 is about 372.0643050856.

The spelling of 51505549 in words is "fifty-one million, five hundred five thousand, five hundred forty-nine".