100000643 has 2 divisors, whose sum is σ = 100000644. Its totient is φ = 100000642.

The previous prime is 100000627. The next prime is 100000651. The reversal of 100000643 is 346000001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 100000643 - 2⁴ = 100000627 is a prime.

It is not a weakly prime, because it can be changed into another prime (100000673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50000321 + 50000322.

It is an arithmetic number, because the mean of its divisors is an integer number (50000322).

Almost surely, 2^100000643 is an apocalyptic number.

100000643 is a deficient number, since it is larger than the sum of its proper divisors (1).

100000643 is an equidigital number, since it uses as much as digits as its factorization.

100000643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 100000643 is about 10000.0321499483. The cubic root of 100000643 is about 464.1598782064.

Adding to 100000643 its reverse (346000001), we get a palindrome (446000644).

The spelling of 100000643 in words is "one hundred million, six hundred forty-three", and thus it is an aban number.