642559201 has 2 divisors, whose sum is σ = 642559202. Its totient is φ = 642559200.

The previous prime is 642559187. The next prime is 642559223. The reversal of 642559201 is 102955246.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 427496976 + 215062225 = 20676^2 + 14665^2 .

It is a cyclic number.

It is not a de Polignac number, because 642559201 - 2¹⁵ = 642526433 is a prime.

It is not a weakly prime, because it can be changed into another prime (642559241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321279600 + 321279601.

It is an arithmetic number, because the mean of its divisors is an integer number (321279601).

Almost surely, 2^642559201 is an apocalyptic number.

It is an amenable number.

642559201 is a deficient number, since it is larger than the sum of its proper divisors (1).

642559201 is an equidigital number, since it uses as much as digits as its factorization.

642559201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 642559201 is about 25348.7514682676. The cubic root of 642559201 is about 862.9210215299.

The spelling of 642559201 in words is "six hundred forty-two million, five hundred fifty-nine thousand, two hundred one".