643211414 has 4 divisors (see below), whose sum is σ = 964817124. Its totient is φ = 321605706.

The previous prime is 643211411. The next prime is 643211417. The reversal of 643211414 is 414112346.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (643211411) and next prime (643211417).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643211411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160802852 + ... + 160802855.

It is an arithmetic number, because the mean of its divisors is an integer number (241204281).

Almost surely, 2^643211414 is an apocalyptic number.

643211414 is a deficient number, since it is larger than the sum of its proper divisors (321605710).

643211414 is a wasteful number, since it uses less digits than its factorization.

643211414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321605709.

The product of its digits is 2304, while the sum is 26.

The square root of 643211414 is about 25361.6130007537. The cubic root of 643211414 is about 863.2128846471.

The spelling of 643211414 in words is "six hundred forty-three million, two hundred eleven thousand, four hundred fourteen".