642071099 has 4 divisors (see below), whose sum is σ = 652953720. Its totient is φ = 631188480.

The previous prime is 642071083. The next prime is 642071153. The reversal of 642071099 is 990170246.

642071099 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 642071099 - 2⁴ = 642071083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642071069) 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, 5441222 + ... + 5441339.

It is an arithmetic number, because the mean of its divisors is an integer number (163238430).

Almost surely, 2^642071099 is an apocalyptic number.

642071099 is a deficient number, since it is larger than the sum of its proper divisors (10882621).

642071099 is a wasteful number, since it uses less digits than its factorization.

642071099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10882620.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 642071099 is about 25339.1219066486. The cubic root of 642071099 is about 862.7024682977.

The spelling of 642071099 in words is "six hundred forty-two million, seventy-one thousand, ninety-nine".