643246043 has 6 divisors (see below), whose sum is σ = 707039172. Its totient is φ = 584769020.

The previous prime is 643246039. The next prime is 643246049. The reversal of 643246043 is 340642346.

It is not a de Polignac number, because 643246043 - 2² = 643246039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643246049) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2657921 + ... + 2658162.

It is an arithmetic number, because the mean of its divisors is an integer number (117839862).

Almost surely, 2^643246043 is an apocalyptic number.

643246043 is a deficient number, since it is larger than the sum of its proper divisors (63793129).

643246043 is a wasteful number, since it uses less digits than its factorization.

643246043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5316105 (or 5316094 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 32.

The square root of 643246043 is about 25362.2956965650. The cubic root of 643246043 is about 863.2283754909.

Adding to 643246043 its reverse (340642346), we get a palindrome (983888389).

The spelling of 643246043 in words is "six hundred forty-three million, two hundred forty-six thousand, forty-three".