128810993 has 2 divisors, whose sum is σ = 128810994. Its totient is φ = 128810992.

The previous prime is 128810977. The next prime is 128811019. The reversal of 128810993 is 399018821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119617969 + 9193024 = 10937^2 + 3032^2 .

It is a cyclic number.

It is not a de Polignac number, because 128810993 - 2⁴ = 128810977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128810993.

It is not a weakly prime, because it can be changed into another prime (128815993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64405496 + 64405497.

It is an arithmetic number, because the mean of its divisors is an integer number (64405497).

Almost surely, 2^128810993 is an apocalyptic number.

It is an amenable number.

128810993 is a deficient number, since it is larger than the sum of its proper divisors (1).

128810993 is an equidigital number, since it uses as much as digits as its factorization.

128810993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 128810993 is about 11349.4930723799. The cubic root of 128810993 is about 505.0305415636.

The spelling of 128810993 in words is "one hundred twenty-eight million, eight hundred ten thousand, nine hundred ninety-three".