643101422 has 4 divisors (see below), whose sum is σ = 964652136. Its totient is φ = 321550710.

The previous prime is 643101397. The next prime is 643101499. The reversal of 643101422 is 224101346.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160775354 + ... + 160775357.

It is an arithmetic number, because the mean of its divisors is an integer number (241163034).

Almost surely, 2^643101422 is an apocalyptic number.

643101422 is a deficient number, since it is larger than the sum of its proper divisors (321550714).

643101422 is a wasteful number, since it uses less digits than its factorization.

643101422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321550713.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 643101422 is about 25359.4444339776. Note that the first 4 decimals coincide. The cubic root of 643101422 is about 863.1636774335.

Adding to 643101422 its reverse (224101346), we get a palindrome (867202768).

The spelling of 643101422 in words is "six hundred forty-three million, one hundred one thousand, four hundred twenty-two".