642182111 has 4 divisors (see below), whose sum is σ = 648073800. Its totient is φ = 636290424.

The previous prime is 642182071. The next prime is 642182117. The reversal of 642182111 is 111281246.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642182111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642182117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2945681 + ... + 2945898.

It is an arithmetic number, because the mean of its divisors is an integer number (162018450).

Almost surely, 2^642182111 is an apocalyptic number.

642182111 is a deficient number, since it is larger than the sum of its proper divisors (5891689).

642182111 is a wasteful number, since it uses less digits than its factorization.

642182111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5891688.

The product of its digits is 768, while the sum is 26.

The square root of 642182111 is about 25341.3123377618. The cubic root of 642182111 is about 862.7521849140.

The spelling of 642182111 in words is "six hundred forty-two million, one hundred eighty-two thousand, one hundred eleven".