634203643 has 4 divisors (see below), whose sum is σ = 651344320. Its totient is φ = 617062968.

The previous prime is 634203637. The next prime is 634203653. The reversal of 634203643 is 346302436.

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 634203643 - 2⁹ = 634203131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634203653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8570283 + ... + 8570356.

It is an arithmetic number, because the mean of its divisors is an integer number (162836080).

Almost surely, 2^634203643 is an apocalyptic number.

634203643 is a deficient number, since it is larger than the sum of its proper divisors (17140677).

634203643 is a wasteful number, since it uses less digits than its factorization.

634203643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17140676.

The product of its (nonzero) digits is 31104, while the sum is 31.

The square root of 634203643 is about 25183.4001477164. The cubic root of 634203643 is about 859.1643419446.

The spelling of 634203643 in words is "six hundred thirty-four million, two hundred three thousand, six hundred forty-three".