642267589 has 2 divisors, whose sum is σ = 642267590. Its totient is φ = 642267588.

The previous prime is 642267547. The next prime is 642267653. The reversal of 642267589 is 985762246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 642216964 + 50625 = 25342^2 + 225^2 .

It is a cyclic number.

It is not a de Polignac number, because 642267589 - 2¹¹ = 642265541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642267539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321133794 + 321133795.

It is an arithmetic number, because the mean of its divisors is an integer number (321133795).

Almost surely, 2^642267589 is an apocalyptic number.

It is an amenable number.

642267589 is a deficient number, since it is larger than the sum of its proper divisors (1).

642267589 is an equidigital number, since it uses as much as digits as its factorization.

642267589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 49.

The square root of 642267589 is about 25342.9988162411. The cubic root of 642267589 is about 862.7904622491.

The spelling of 642267589 in words is "six hundred forty-two million, two hundred sixty-seven thousand, five hundred eighty-nine".