644034371 has 2 divisors, whose sum is σ = 644034372. Its totient is φ = 644034370.

The previous prime is 644034361. The next prime is 644034379. The reversal of 644034371 is 173430446.

644034371 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-644034371 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (644034379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322017185 + 322017186.

It is an arithmetic number, because the mean of its divisors is an integer number (322017186).

Almost surely, 2^644034371 is an apocalyptic number.

644034371 is a deficient number, since it is larger than the sum of its proper divisors (1).

644034371 is an equidigital number, since it uses as much as digits as its factorization.

644034371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 32.

The square root of 644034371 is about 25377.8322754328. The cubic root of 644034371 is about 863.5808737288.

The spelling of 644034371 in words is "six hundred forty-four million, thirty-four thousand, three hundred seventy-one".