128702993 has 2 divisors, whose sum is σ = 128702994. Its totient is φ = 128702992.

The previous prime is 128702953. The next prime is 128703031. The reversal of 128702993 is 399207821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102252544 + 26450449 = 10112^2 + 5143^2 .

It is a cyclic number.

It is not a de Polignac number, because 128702993 - 2⁸ = 128702737 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 128702993.

It is not a weakly prime, because it can be changed into another prime (128702923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64351496 + 64351497.

It is an arithmetic number, because the mean of its divisors is an integer number (64351497).

Almost surely, 2^128702993 is an apocalyptic number.

It is an amenable number.

128702993 is a deficient number, since it is larger than the sum of its proper divisors (1).

128702993 is an equidigital number, since it uses as much as digits as its factorization.

128702993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 128702993 is about 11344.7341529011. The cubic root of 128702993 is about 504.8893565399.

The spelling of 128702993 in words is "one hundred twenty-eight million, seven hundred two thousand, nine hundred ninety-three".