643096907 has 4 divisors (see below), whose sum is σ = 643268520. Its totient is φ = 642925296.

The previous prime is 643096903. The next prime is 643096919. The reversal of 643096907 is 709690346.

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 643096907 - 2² = 643096903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643096903) 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, 80057 + ... + 87722.

It is an arithmetic number, because the mean of its divisors is an integer number (160817130).

Almost surely, 2^643096907 is an apocalyptic number.

643096907 is a deficient number, since it is larger than the sum of its proper divisors (171613).

643096907 is a wasteful number, since it uses less digits than its factorization.

643096907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171612.

The product of its (nonzero) digits is 244944, while the sum is 44.

The square root of 643096907 is about 25359.3554137324. The cubic root of 643096907 is about 863.1616574343.

The spelling of 643096907 in words is "six hundred forty-three million, ninety-six thousand, nine hundred seven".