643144122 has 48 divisors (see below), whose sum is σ = 1448883072. Its totient is φ = 206015040.

The previous prime is 643144109. The next prime is 643144157. The reversal of 643144122 is 221441346.

It is a happy number.

643144122 is a `hidden beast` number, since 643 + 1 + 4 + 4 + 12 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42943 + ... + 55949.

It is an arithmetic number, because the mean of its divisors is an integer number (30185064).

Almost surely, 2^643144122 is an apocalyptic number.

643144122 is an abundant number, since it is smaller than the sum of its proper divisors (805738950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643144122 is a wasteful number, since it uses less digits than its factorization.

643144122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13123 (or 13120 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 643144122 is about 25360.2863154184. The cubic root of 643144122 is about 863.1827808347.

Adding to 643144122 its reverse (221441346), we get a palindrome (864585468).

The spelling of 643144122 in words is "six hundred forty-three million, one hundred forty-four thousand, one hundred twenty-two".