644460941 has 2 divisors, whose sum is σ = 644460942. Its totient is φ = 644460940.

The previous prime is 644460923. The next prime is 644460959. The reversal of 644460941 is 149064446.

644460941 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (644460923) and next prime (644460959).

It can be written as a sum of positive squares in only one way, i.e., 597606916 + 46854025 = 24446^2 + 6845^2 .

It is a cyclic number.

It is not a de Polignac number, because 644460941 - 2²⁶ = 577352077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 644460895 and 644460904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644460911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322230470 + 322230471.

It is an arithmetic number, because the mean of its divisors is an integer number (322230471).

Almost surely, 2^644460941 is an apocalyptic number.

It is an amenable number.

644460941 is a deficient number, since it is larger than the sum of its proper divisors (1).

644460941 is an equidigital number, since it uses as much as digits as its factorization.

644460941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 644460941 is about 25386.2352663801. The cubic root of 644460941 is about 863.7714931581.

The spelling of 644460941 in words is "six hundred forty-four million, four hundred sixty thousand, nine hundred forty-one".