642506113 has 2 divisors, whose sum is σ = 642506114. Its totient is φ = 642506112.

The previous prime is 642506101. The next prime is 642506149. The reversal of 642506113 is 311605246.

642506113 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 520889329 + 121616784 = 22823^2 + 11028^2 .

It is a cyclic number.

It is not a de Polignac number, because 642506113 - 2⁹ = 642505601 is a prime.

It is not a weakly prime, because it can be changed into another prime (642506213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321253056 + 321253057.

It is an arithmetic number, because the mean of its divisors is an integer number (321253057).

Almost surely, 2^642506113 is an apocalyptic number.

It is an amenable number.

642506113 is a deficient number, since it is larger than the sum of its proper divisors (1).

642506113 is an equidigital number, since it uses as much as digits as its factorization.

642506113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 642506113 is about 25347.7042944721. The cubic root of 642506113 is about 862.8972561384.

The spelling of 642506113 in words is "six hundred forty-two million, five hundred six thousand, one hundred thirteen".