643101442 has 16 divisors (see below), whose sum is σ = 970820352. Its totient is φ = 319500720.

The previous prime is 643101397. The next prime is 643101499. The reversal of 643101442 is 244101346.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 299023 + ... + 301165.

It is an arithmetic number, because the mean of its divisors is an integer number (60676272).

Almost surely, 2^643101442 is an apocalyptic number.

643101442 is a deficient number, since it is larger than the sum of its proper divisors (327718910).

643101442 is a wasteful number, since it uses less digits than its factorization.

643101442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3033.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 643101442 is about 25359.4448283081. Note that the first 3 decimals coincide. The cubic root of 643101442 is about 863.1636863815.

Adding to 643101442 its reverse (244101346), we get a palindrome (887202788).

The spelling of 643101442 in words is "six hundred forty-three million, one hundred one thousand, four hundred forty-two".