128916247 has 2 divisors, whose sum is σ = 128916248. Its totient is φ = 128916246.

The previous prime is 128916187. The next prime is 128916283. The reversal of 128916247 is 742619821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128916247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128916647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64458123 + 64458124.

It is an arithmetic number, because the mean of its divisors is an integer number (64458124).

Almost surely, 2^128916247 is an apocalyptic number.

128916247 is a deficient number, since it is larger than the sum of its proper divisors (1).

128916247 is an equidigital number, since it uses as much as digits as its factorization.

128916247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 128916247 is about 11354.1290727206. The cubic root of 128916247 is about 505.1680609154.

The spelling of 128916247 in words is "one hundred twenty-eight million, nine hundred sixteen thousand, two hundred forty-seven".