643414431 has 16 divisors (see below), whose sum is σ = 937525248. Its totient is φ = 389260800.

The previous prime is 643414403. The next prime is 643414441. The reversal of 643414431 is 134414346.

It is not a de Polignac number, because 643414431 - 2⁹ = 643413919 is a prime.

It is a super-2 number, since 2×643414431² = 827964260038107522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643414441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2146 + ... + 35936.

It is an arithmetic number, because the mean of its divisors is an integer number (58595328).

Almost surely, 2^643414431 is an apocalyptic number.

643414431 is a deficient number, since it is larger than the sum of its proper divisors (294110817).

643414431 is a wasteful number, since it uses less digits than its factorization.

643414431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34382.

The product of its digits is 13824, while the sum is 30.

The square root of 643414431 is about 25365.6151315122. The cubic root of 643414431 is about 863.3036938025.

Adding to 643414431 its reverse (134414346), we get a palindrome (777828777).

The spelling of 643414431 in words is "six hundred forty-three million, four hundred fourteen thousand, four hundred thirty-one".