644297 has 2 divisors, whose sum is σ = 644298. Its totient is φ = 644296.

The previous prime is 644291. The next prime is 644327. The reversal of 644297 is 792446.

644297 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., 440896 + 203401 = 664^2 + 451^2 .

It is a cyclic number.

It is not a de Polignac number, because 644297 - 2¹⁰ = 643273 is a prime.

It is not a weakly prime, because it can be changed into another prime (644291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322148 + 322149.

It is an arithmetic number, because the mean of its divisors is an integer number (322149).

2⁶⁴⁴²⁹⁷ is an apocalyptic number.

It is an amenable number.

644297 is a deficient number, since it is larger than the sum of its proper divisors (1).

644297 is an equidigital number, since it uses as much as digits as its factorization.

644297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 644297 is about 802.6811322063. The cubic root of 644297 is about 86.3698243531.

The spelling of 644297 in words is "six hundred forty-four thousand, two hundred ninety-seven".