128165047 has 2 divisors, whose sum is σ = 128165048. Its totient is φ = 128165046.

The previous prime is 128165027. The next prime is 128165071. The reversal of 128165047 is 740561821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128165047 - 2⁷ = 128164919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128165017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64082523 + 64082524.

It is an arithmetic number, because the mean of its divisors is an integer number (64082524).

Almost surely, 2^128165047 is an apocalyptic number.

128165047 is a deficient number, since it is larger than the sum of its proper divisors (1).

128165047 is an equidigital number, since it uses as much as digits as its factorization.

128165047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 128165047 is about 11321.0002649943. Note that the first 3 decimals coincide. The cubic root of 128165047 is about 504.1849375373.

The spelling of 128165047 in words is "one hundred twenty-eight million, one hundred sixty-five thousand, forty-seven".