643015042 has 4 divisors (see below), whose sum is σ = 964522566. Its totient is φ = 321507520.

The previous prime is 643015039. The next prime is 643015067. The reversal of 643015042 is 240510346.

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

It can be written as a sum of positive squares in only one way, i.e., 538750521 + 104264521 = 23211^2 + 10211^2 .

It is a junction number, because it is equal to n+sod(n) for n = 643014998 and 643015016.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160753759 + ... + 160753762.

Almost surely, 2^643015042 is an apocalyptic number.

643015042 is a deficient number, since it is larger than the sum of its proper divisors (321507524).

643015042 is a wasteful number, since it uses less digits than its factorization.

643015042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321507523.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 643015042 is about 25357.7412637640. The cubic root of 643015042 is about 863.1250296068.

Adding to 643015042 its reverse (240510346), we get a palindrome (883525388).

The spelling of 643015042 in words is "six hundred forty-three million, fifteen thousand, forty-two".