644601341 has 2 divisors, whose sum is σ = 644601342. Its totient is φ = 644601340.

The previous prime is 644601283. The next prime is 644601343. The reversal of 644601341 is 143106446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 389272900 + 255328441 = 19730^2 + 15979^2 .

It is a cyclic number.

It is not a de Polignac number, because 644601341 - 2¹⁰ = 644600317 is a prime.

Together with 644601343, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644601343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322300670 + 322300671.

It is an arithmetic number, because the mean of its divisors is an integer number (322300671).

Almost surely, 2^644601341 is an apocalyptic number.

It is an amenable number.

644601341 is a deficient number, since it is larger than the sum of its proper divisors (1).

644601341 is an equidigital number, since it uses as much as digits as its factorization.

644601341 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 644601341 is about 25389.0003938714. Note that the first 3 decimals coincide. The cubic root of 644601341 is about 863.8342146794.

Adding to 644601341 its reverse (143106446), we get a palindrome (787707787).

The spelling of 644601341 in words is "six hundred forty-four million, six hundred one thousand, three hundred forty-one".