644127349 has 2 divisors, whose sum is σ = 644127350. Its totient is φ = 644127348.

The previous prime is 644127329. The next prime is 644127377. The reversal of 644127349 is 943721446.

644127349 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., 509404900 + 134722449 = 22570^2 + 11607^2 .

It is a cyclic number.

It is not a de Polignac number, because 644127349 - 2⁵ = 644127317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644127329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322063674 + 322063675.

It is an arithmetic number, because the mean of its divisors is an integer number (322063675).

Almost surely, 2^644127349 is an apocalyptic number.

It is an amenable number.

644127349 is a deficient number, since it is larger than the sum of its proper divisors (1).

644127349 is an equidigital number, since it uses as much as digits as its factorization.

644127349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 40.

The square root of 644127349 is about 25379.6640836714. The cubic root of 644127349 is about 863.6224295642.

The spelling of 644127349 in words is "six hundred forty-four million, one hundred twenty-seven thousand, three hundred forty-nine".