642244611 has 4 divisors (see below), whose sum is σ = 856326152. Its totient is φ = 428163072.

The previous prime is 642244609. The next prime is 642244627. The reversal of 642244611 is 116442246.

It is a happy number.

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

It is not a de Polignac number, because 642244611 - 2¹ = 642244609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642244651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107040766 + ... + 107040771.

It is an arithmetic number, because the mean of its divisors is an integer number (214081538).

Almost surely, 2^642244611 is an apocalyptic number.

642244611 is a deficient number, since it is larger than the sum of its proper divisors (214081541).

642244611 is a wasteful number, since it uses less digits than its factorization.

642244611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214081540.

The product of its digits is 9216, while the sum is 30.

The square root of 642244611 is about 25342.5454719924. The cubic root of 642244611 is about 862.7801729574.

Adding to 642244611 its reverse (116442246), we get a palindrome (758686857).

The spelling of 642244611 in words is "six hundred forty-two million, two hundred forty-four thousand, six hundred eleven".