643350914 has 4 divisors (see below), whose sum is σ = 965026374. Its totient is φ = 321675456.

The previous prime is 643350893. The next prime is 643350937. The reversal of 643350914 is 419053346.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 454755625 + 188595289 = 21325^2 + 13733^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160837727 + ... + 160837730.

Almost surely, 2^643350914 is an apocalyptic number.

643350914 is a deficient number, since it is larger than the sum of its proper divisors (321675460).

643350914 is a wasteful number, since it uses less digits than its factorization.

643350914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321675459.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 643350914 is about 25364.3630710491. The cubic root of 643350914 is about 863.2752848110.

The spelling of 643350914 in words is "six hundred forty-three million, three hundred fifty thousand, nine hundred fourteen".