634243111 has 2 divisors, whose sum is σ = 634243112. Its totient is φ = 634243110.

The previous prime is 634243087. The next prime is 634243153. The reversal of 634243111 is 111342436.

634243111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634243111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634243171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317121555 + 317121556.

It is an arithmetic number, because the mean of its divisors is an integer number (317121556).

Almost surely, 2^634243111 is an apocalyptic number.

634243111 is a deficient number, since it is larger than the sum of its proper divisors (1).

634243111 is an equidigital number, since it uses as much as digits as its factorization.

634243111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 25.

The square root of 634243111 is about 25184.1837469472. The cubic root of 634243111 is about 859.1821641879.

Adding to 634243111 its reverse (111342436), we get a palindrome (745585547).

The spelling of 634243111 in words is "six hundred thirty-four million, two hundred forty-three thousand, one hundred eleven".