642419689 has 2 divisors, whose sum is σ = 642419690. Its totient is φ = 642419688.

The previous prime is 642419653. The next prime is 642419717. The reversal of 642419689 is 986914246.

642419689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 562496089 + 79923600 = 23717^2 + 8940^2 .

It is a cyclic number.

It is not a de Polignac number, because 642419689 - 2²¹ = 640322537 is a prime.

It is not a weakly prime, because it can be changed into another prime (642419639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321209844 + 321209845.

It is an arithmetic number, because the mean of its divisors is an integer number (321209845).

Almost surely, 2^642419689 is an apocalyptic number.

It is an amenable number.

642419689 is a deficient number, since it is larger than the sum of its proper divisors (1).

642419689 is an equidigital number, since it uses as much as digits as its factorization.

642419689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 49.

The square root of 642419689 is about 25345.9994673716. Note that the first 3 decimals coincide. The cubic root of 642419689 is about 862.8585647418.

The spelling of 642419689 in words is "six hundred forty-two million, four hundred nineteen thousand, six hundred eighty-nine".