643914119 has 4 divisors (see below), whose sum is σ = 656063496. Its totient is φ = 631764744.

The previous prime is 643914107. The next prime is 643914179. The reversal of 643914119 is 911419346.

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

It is a cyclic number.

It is not a de Polignac number, because 643914119 - 2¹² = 643910023 is a prime.

It is a super-2 number, since 2×643914119² = 829250785295092322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643914179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6074609 + ... + 6074714.

It is an arithmetic number, because the mean of its divisors is an integer number (164015874).

Almost surely, 2^643914119 is an apocalyptic number.

643914119 is a deficient number, since it is larger than the sum of its proper divisors (12149377).

643914119 is a wasteful number, since it uses less digits than its factorization.

643914119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12149376.

The product of its digits is 23328, while the sum is 38.

The square root of 643914119 is about 25375.4629317378. The cubic root of 643914119 is about 863.5271220473.

The spelling of 643914119 in words is "six hundred forty-three million, nine hundred fourteen thousand, one hundred nineteen".