634331143 has 4 divisors (see below), whose sum is σ = 643798840. Its totient is φ = 624863448.

The previous prime is 634331119. The next prime is 634331161. The reversal of 634331143 is 341133436.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634331143 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 (634338143) 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, 4733748 + ... + 4733881.

It is an arithmetic number, because the mean of its divisors is an integer number (160949710).

Almost surely, 2^634331143 is an apocalyptic number.

634331143 is a deficient number, since it is larger than the sum of its proper divisors (9467697).

634331143 is an equidigital number, since it uses as much as digits as its factorization.

634331143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9467696.

The product of its digits is 7776, while the sum is 28.

The square root of 634331143 is about 25185.9314499186. The cubic root of 634331143 is about 859.2219134175.

Adding to 634331143 its reverse (341133436), we get a palindrome (975464579).

The spelling of 634331143 in words is "six hundred thirty-four million, three hundred thirty-one thousand, one hundred forty-three".