634013543 has 4 divisors (see below), whose sum is σ = 648758088. Its totient is φ = 619269000.

The previous prime is 634013539. The next prime is 634013557. The reversal of 634013543 is 345310436.

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 634013543 - 2² = 634013539 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634013143) 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, 7372208 + ... + 7372293.

It is an arithmetic number, because the mean of its divisors is an integer number (162189522).

Almost surely, 2^634013543 is an apocalyptic number.

634013543 is a deficient number, since it is larger than the sum of its proper divisors (14744545).

634013543 is a wasteful number, since it uses less digits than its factorization.

634013543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14744544.

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 634013543 is about 25179.6255532127. The cubic root of 634013543 is about 859.0784896768.

Adding to 634013543 its reverse (345310436), we get a palindrome (979323979).

The spelling of 634013543 in words is "six hundred thirty-four million, thirteen thousand, five hundred forty-three".