634736899 has 4 divisors (see below), whose sum is σ = 635766264. Its totient is φ = 633707536.

The previous prime is 634736881. The next prime is 634736941. The reversal of 634736899 is 998637436.

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 634736899 - 2¹³ = 634728707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634736099) 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 in 3 ways as a sum of consecutive naturals, for example, 513757 + ... + 514990.

It is an arithmetic number, because the mean of its divisors is an integer number (158941566).

Almost surely, 2^634736899 is an apocalyptic number.

634736899 is a deficient number, since it is larger than the sum of its proper divisors (1029365).

634736899 is a wasteful number, since it uses less digits than its factorization.

634736899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029364.

The product of its digits is 5878656, while the sum is 55.

The square root of 634736899 is about 25193.9853734974. The cubic root of 634736899 is about 859.4050775483.

The spelling of 634736899 in words is "six hundred thirty-four million, seven hundred thirty-six thousand, eight hundred ninety-nine".