644046371 has 2 divisors, whose sum is σ = 644046372. Its totient is φ = 644046370.

The previous prime is 644046313. The next prime is 644046379. The reversal of 644046371 is 173640446.

644046371 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 not a de Polignac number, because 644046371 - 2⁶ = 644046307 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (644046379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322023185 + 322023186.

It is an arithmetic number, because the mean of its divisors is an integer number (322023186).

Almost surely, 2^644046371 is an apocalyptic number.

644046371 is a deficient number, since it is larger than the sum of its proper divisors (1).

644046371 is an equidigital number, since it uses as much as digits as its factorization.

644046371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 644046371 is about 25378.0687011443. The cubic root of 644046371 is about 863.5862372656.

The spelling of 644046371 in words is "six hundred forty-four million, forty-six thousand, three hundred seventy-one".