634040553 has 4 divisors (see below), whose sum is σ = 845387408. Its totient is φ = 422693700.

The previous prime is 634040549. The next prime is 634040557. The reversal of 634040553 is 355040436.

634040553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (634040549) and next prime (634040557).

It is not a de Polignac number, because 634040553 - 2² = 634040549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 634040553.

It is not an unprimeable number, because it can be changed into a prime (634040557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105673423 + ... + 105673428.

It is an arithmetic number, because the mean of its divisors is an integer number (211346852).

Almost surely, 2^634040553 is an apocalyptic number.

It is an amenable number.

634040553 is a deficient number, since it is larger than the sum of its proper divisors (211346855).

634040553 is a wasteful number, since it uses less digits than its factorization.

634040553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211346854.

The product of its (nonzero) digits is 21600, while the sum is 30.

The square root of 634040553 is about 25180.1618938402. The cubic root of 634040553 is about 859.0906888802.

Adding to 634040553 its reverse (355040436), we get a palindrome (989080989).

The spelling of 634040553 in words is "six hundred thirty-four million, forty thousand, five hundred fifty-three".