128815927 has 2 divisors, whose sum is σ = 128815928. Its totient is φ = 128815926.

The previous prime is 128815867. The next prime is 128815931. The reversal of 128815927 is 729518821.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128815927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128815937) 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, 64407963 + 64407964.

It is an arithmetic number, because the mean of its divisors is an integer number (64407964).

Almost surely, 2^128815927 is an apocalyptic number.

128815927 is a deficient number, since it is larger than the sum of its proper divisors (1).

128815927 is an equidigital number, since it uses as much as digits as its factorization.

128815927 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 43.

The square root of 128815927 is about 11349.7104368349. The cubic root of 128815927 is about 505.0369897423.

The spelling of 128815927 in words is "one hundred twenty-eight million, eight hundred fifteen thousand, nine hundred twenty-seven".