634489993 has 2 divisors, whose sum is σ = 634489994. Its totient is φ = 634489992.

The previous prime is 634489987. The next prime is 634490011. The reversal of 634489993 is 399984436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 362635849 + 271854144 = 19043^2 + 16488^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634489993 is a prime.

It is not a weakly prime, because it can be changed into another prime (634489913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317244996 + 317244997.

It is an arithmetic number, because the mean of its divisors is an integer number (317244997).

Almost surely, 2^634489993 is an apocalyptic number.

It is an amenable number.

634489993 is a deficient number, since it is larger than the sum of its proper divisors (1).

634489993 is an equidigital number, since it uses as much as digits as its factorization.

634489993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5038848, while the sum is 55.

The square root of 634489993 is about 25189.0847987774. The cubic root of 634489993 is about 859.2936299076.

It can be divided in two parts, 63448 and 9993, that added together give a square (73441 = 271²).

The spelling of 634489993 in words is "six hundred thirty-four million, four hundred eighty-nine thousand, nine hundred ninety-three".