51016649 has 2 divisors, whose sum is σ = 51016650. Its totient is φ = 51016648.

The previous prime is 51016639. The next prime is 51016733. The reversal of 51016649 is 94661015.

51016649 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., 40551424 + 10465225 = 6368^2 + 3235^2 .

It is a cyclic number.

It is not a de Polignac number, because 51016649 - 2⁴ = 51016633 is a prime.

It is not a weakly prime, because it can be changed into another prime (51016639) 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, 25508324 + 25508325.

It is an arithmetic number, because the mean of its divisors is an integer number (25508325).

Almost surely, 2^51016649 is an apocalyptic number.

It is an amenable number.

51016649 is a deficient number, since it is larger than the sum of its proper divisors (1).

51016649 is an equidigital number, since it uses as much as digits as its factorization.

51016649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 51016649 is about 7142.5939965814. The cubic root of 51016649 is about 370.8833265540.

The spelling of 51016649 in words is "fifty-one million, sixteen thousand, six hundred forty-nine".