642608107 has 2 divisors, whose sum is σ = 642608108. Its totient is φ = 642608106.

The previous prime is 642608089. The next prime is 642608137. The reversal of 642608107 is 701806246.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642608107 is a prime.

It is not a weakly prime, because it can be changed into another prime (642608137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321304053 + 321304054.

It is an arithmetic number, because the mean of its divisors is an integer number (321304054).

Almost surely, 2^642608107 is an apocalyptic number.

642608107 is a deficient number, since it is larger than the sum of its proper divisors (1).

642608107 is an equidigital number, since it uses as much as digits as its factorization.

642608107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 642608107 is about 25349.7161128088. The cubic root of 642608107 is about 862.9429136475.

The spelling of 642608107 in words is "six hundred forty-two million, six hundred eight thousand, one hundred seven".