644046119 has 2 divisors, whose sum is σ = 644046120. Its totient is φ = 644046118.

The previous prime is 644046107. The next prime is 644046121. The reversal of 644046119 is 911640446.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 644046119 - 2⁴ = 644046103 is a prime.

It is a super-2 number, since 2×644046119² = 829590806797924322, which contains 22 as substring.

Together with 644046121, 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 (644046149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322023059 + 322023060.

It is an arithmetic number, because the mean of its divisors is an integer number (322023060).

Almost surely, 2^644046119 is an apocalyptic number.

644046119 is a deficient number, since it is larger than the sum of its proper divisors (1).

644046119 is an equidigital number, since it uses as much as digits as its factorization.

644046119 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 644046119 is about 25378.0637362270. The cubic root of 644046119 is about 863.5861246320.

The spelling of 644046119 in words is "six hundred forty-four million, forty-six thousand, one hundred nineteen".