646389127 has 2 divisors, whose sum is σ = 646389128. Its totient is φ = 646389126.

The previous prime is 646389109. The next prime is 646389137. The reversal of 646389127 is 721983646.

646389127 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646389127 - 2²⁷ = 512171399 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646389137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323194563 + 323194564.

It is an arithmetic number, because the mean of its divisors is an integer number (323194564).

Almost surely, 2^646389127 is an apocalyptic number.

646389127 is a deficient number, since it is larger than the sum of its proper divisors (1).

646389127 is an equidigital number, since it uses as much as digits as its factorization.

646389127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 46.

The square root of 646389127 is about 25424.1839003733. The cubic root of 646389127 is about 864.6320851737.

The spelling of 646389127 in words is "six hundred forty-six million, three hundred eighty-nine thousand, one hundred twenty-seven".