643214319 has 16 divisors (see below), whose sum is σ = 965766144. Its totient is φ = 377251200.

The previous prime is 643214309. The next prime is 643214321. The reversal of 643214319 is 913412346.

It is not a de Polignac number, because 643214319 - 2¹⁷ = 643083247 is a prime.

It is a super-2 number, since 2×643214319² = 827449320333267522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a self number, because there is not a number n which added to its sum of digits gives 643214319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643214309) 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 in 15 ways as a sum of consecutive naturals, for example, 313354 + ... + 315399.

It is an arithmetic number, because the mean of its divisors is an integer number (60360384).

Almost surely, 2^643214319 is an apocalyptic number.

643214319 is a deficient number, since it is larger than the sum of its proper divisors (322551825).

643214319 is a wasteful number, since it uses less digits than its factorization.

643214319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628798.

The product of its digits is 15552, while the sum is 33.

The square root of 643214319 is about 25361.6702722829. The cubic root of 643214319 is about 863.2141841834.

The spelling of 643214319 in words is "six hundred forty-three million, two hundred fourteen thousand, three hundred nineteen".