642215107 has 2 divisors, whose sum is σ = 642215108. Its totient is φ = 642215106.

The previous prime is 642215099. The next prime is 642215129. The reversal of 642215107 is 701512246.

642215107 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 is a cyclic number.

It is not a de Polignac number, because 642215107 - 2³ = 642215099 is a prime.

It is not a weakly prime, because it can be changed into another prime (642215207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321107553 + 321107554.

It is an arithmetic number, because the mean of its divisors is an integer number (321107554).

Almost surely, 2^642215107 is an apocalyptic number.

642215107 is a deficient number, since it is larger than the sum of its proper divisors (1).

642215107 is an equidigital number, since it uses as much as digits as its factorization.

642215107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 642215107 is about 25341.9633611920. The cubic root of 642215107 is about 862.7669610360.

The spelling of 642215107 in words is "six hundred forty-two million, two hundred fifteen thousand, one hundred seven".