642281459 has 2 divisors, whose sum is σ = 642281460. Its totient is φ = 642281458.

The previous prime is 642281449. The next prime is 642281477. The reversal of 642281459 is 954182246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642281459 - 2⁴ = 642281443 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (642281449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321140729 + 321140730.

It is an arithmetic number, because the mean of its divisors is an integer number (321140730).

Almost surely, 2^642281459 is an apocalyptic number.

642281459 is a deficient number, since it is larger than the sum of its proper divisors (1).

642281459 is an equidigital number, since it uses as much as digits as its factorization.

642281459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 41.

The square root of 642281459 is about 25343.2724603592. The cubic root of 642281459 is about 862.7966729614.

The spelling of 642281459 in words is "six hundred forty-two million, two hundred eighty-one thousand, four hundred fifty-nine".