643354619 has 2 divisors, whose sum is σ = 643354620. Its totient is φ = 643354618.

The previous prime is 643354609. The next prime is 643354633. The reversal of 643354619 is 916453346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643354619 - 2¹⁶ = 643289083 is a prime.

It is a super-2 number, since 2×643354619² = 827810331577270322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (643354609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321677309 + 321677310.

It is an arithmetic number, because the mean of its divisors is an integer number (321677310).

Almost surely, 2^643354619 is an apocalyptic number.

643354619 is a deficient number, since it is larger than the sum of its proper divisors (1).

643354619 is an equidigital number, since it uses as much as digits as its factorization.

643354619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 41.

The square root of 643354619 is about 25364.4361064858. The cubic root of 643354619 is about 863.2769419827.

The spelling of 643354619 in words is "six hundred forty-three million, three hundred fifty-four thousand, six hundred nineteen".