642552307 has 2 divisors, whose sum is σ = 642552308. Its totient is φ = 642552306.

The previous prime is 642552293. The next prime is 642552341. The reversal of 642552307 is 703255246.

642552307 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (642552341) can be obtained adding 642552307 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642552307 is a prime.

It is not a weakly prime, because it can be changed into another prime (642552367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321276153 + 321276154.

It is an arithmetic number, because the mean of its divisors is an integer number (321276154).

Almost surely, 2^642552307 is an apocalyptic number.

642552307 is a deficient number, since it is larger than the sum of its proper divisors (1).

642552307 is an equidigital number, since it uses as much as digits as its factorization.

642552307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 34.

The square root of 642552307 is about 25348.6154848741. The cubic root of 642552307 is about 862.9179354335.

The spelling of 642552307 in words is "six hundred forty-two million, five hundred fifty-two thousand, three hundred seven".