642906883 has 2 divisors, whose sum is σ = 642906884. Its totient is φ = 642906882.

The previous prime is 642906871. The next prime is 642906899. The reversal of 642906883 is 388609246.

It is a happy number.

642906883 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642906883 - 2⁹ = 642906371 is a prime.

It is not a weakly prime, because it can be changed into another prime (642906083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321453441 + 321453442.

It is an arithmetic number, because the mean of its divisors is an integer number (321453442).

Almost surely, 2^642906883 is an apocalyptic number.

642906883 is a deficient number, since it is larger than the sum of its proper divisors (1).

642906883 is an equidigital number, since it uses as much as digits as its factorization.

642906883 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 46.

The square root of 642906883 is about 25355.6085117277. The cubic root of 642906883 is about 863.0766326183.

The spelling of 642906883 in words is "six hundred forty-two million, nine hundred six thousand, eight hundred eighty-three".