642006049 has 2 divisors, whose sum is σ = 642006050. Its totient is φ = 642006048.

The previous prime is 642006017. The next prime is 642006059. The reversal of 642006049 is 940600246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 633780625 + 8225424 = 25175^2 + 2868^2 .

It is a cyclic number.

It is not a de Polignac number, because 642006049 - 2⁵ = 642006017 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642006049.

It is not a weakly prime, because it can be changed into another prime (642006059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321003024 + 321003025.

It is an arithmetic number, because the mean of its divisors is an integer number (321003025).

Almost surely, 2^642006049 is an apocalyptic number.

It is an amenable number.

642006049 is a deficient number, since it is larger than the sum of its proper divisors (1).

642006049 is an equidigital number, since it uses as much as digits as its factorization.

642006049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 642006049 is about 25337.8382858522. The cubic root of 642006049 is about 862.6733330555.

The spelling of 642006049 in words is "six hundred forty-two million, six thousand, forty-nine".