120644647 has 2 divisors, whose sum is σ = 120644648. Its totient is φ = 120644646.

The previous prime is 120644599. The next prime is 120644651. The reversal of 120644647 is 746446021.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120644647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120644687) 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, 60322323 + 60322324.

It is an arithmetic number, because the mean of its divisors is an integer number (60322324).

Almost surely, 2^120644647 is an apocalyptic number.

120644647 is a deficient number, since it is larger than the sum of its proper divisors (1).

120644647 is an equidigital number, since it uses as much as digits as its factorization.

120644647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 120644647 is about 10983.8357143577. The cubic root of 120644647 is about 494.1240803015.

The spelling of 120644647 in words is "one hundred twenty million, six hundred forty-four thousand, six hundred forty-seven".