643095379 has 2 divisors, whose sum is σ = 643095380. Its totient is φ = 643095378.

The previous prime is 643095377. The next prime is 643095419. The reversal of 643095379 is 973590346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643095379 - 2¹ = 643095377 is a prime.

Together with 643095377, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (643095377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321547689 + 321547690.

It is an arithmetic number, because the mean of its divisors is an integer number (321547690).

Almost surely, 2^643095379 is an apocalyptic number.

643095379 is a deficient number, since it is larger than the sum of its proper divisors (1).

643095379 is an equidigital number, since it uses as much as digits as its factorization.

643095379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 46.

The square root of 643095379 is about 25359.3252867658. The cubic root of 643095379 is about 863.1609738090.

The spelling of 643095379 in words is "six hundred forty-three million, ninety-five thousand, three hundred seventy-nine".