128815963 has 2 divisors, whose sum is σ = 128815964. Its totient is φ = 128815962.

The previous prime is 128815937. The next prime is 128815979. The reversal of 128815963 is 369518821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128815963 - 2⁵ = 128815931 is a prime.

It is not a weakly prime, because it can be changed into another prime (128815993) 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, 64407981 + 64407982.

It is an arithmetic number, because the mean of its divisors is an integer number (64407982).

Almost surely, 2^128815963 is an apocalyptic number.

128815963 is a deficient number, since it is larger than the sum of its proper divisors (1).

128815963 is an equidigital number, since it uses as much as digits as its factorization.

128815963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 43.

The square root of 128815963 is about 11349.7120227784. The cubic root of 128815963 is about 505.0370367896.

The spelling of 128815963 in words is "one hundred twenty-eight million, eight hundred fifteen thousand, nine hundred sixty-three".