128815499 has 2 divisors, whose sum is σ = 128815500. Its totient is φ = 128815498.

The previous prime is 128815471. The next prime is 128815507. The reversal of 128815499 is 994518821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128815499 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128815439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64407749 + 64407750.

It is an arithmetic number, because the mean of its divisors is an integer number (64407750).

Almost surely, 2^128815499 is an apocalyptic number.

128815499 is a deficient number, since it is larger than the sum of its proper divisors (1).

128815499 is an equidigital number, since it uses as much as digits as its factorization.

128815499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 47.

The square root of 128815499 is about 11349.6915817127. The cubic root of 128815499 is about 505.0364304013.

The spelling of 128815499 in words is "one hundred twenty-eight million, eight hundred fifteen thousand, four hundred ninety-nine".