128693633 has 2 divisors, whose sum is σ = 128693634. Its totient is φ = 128693632.

The previous prime is 128693603. The next prime is 128693639. The reversal of 128693633 is 336396821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108326464 + 20367169 = 10408^2 + 4513^2 .

It is an emirp because it is prime and its reverse (336396821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128693633 - 2⁶ = 128693569 is a prime.

It is not a weakly prime, because it can be changed into another prime (128693639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64346816 + 64346817.

It is an arithmetic number, because the mean of its divisors is an integer number (64346817).

Almost surely, 2^128693633 is an apocalyptic number.

It is an amenable number.

128693633 is a deficient number, since it is larger than the sum of its proper divisors (1).

128693633 is an equidigital number, since it uses as much as digits as its factorization.

128693633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 41.

The square root of 128693633 is about 11344.3216192067. The cubic root of 128693633 is about 504.8771167858.

The spelling of 128693633 in words is "one hundred twenty-eight million, six hundred ninety-three thousand, six hundred thirty-three".