128997833 has 2 divisors, whose sum is σ = 128997834. Its totient is φ = 128997832.

The previous prime is 128997811. The next prime is 128997857. The reversal of 128997833 is 338799821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128981449 + 16384 = 11357^2 + 128^2 .

It is a cyclic number.

It is not a de Polignac number, because 128997833 - 2⁶ = 128997769 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128997863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64498916 + 64498917.

It is an arithmetic number, because the mean of its divisors is an integer number (64498917).

Almost surely, 2^128997833 is an apocalyptic number.

It is an amenable number.

128997833 is a deficient number, since it is larger than the sum of its proper divisors (1).

128997833 is an equidigital number, since it uses as much as digits as its factorization.

128997833 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 50.

The square root of 128997833 is about 11357.7212943442. The cubic root of 128997833 is about 505.2746054125.

The spelling of 128997833 in words is "one hundred twenty-eight million, nine hundred ninety-seven thousand, eight hundred thirty-three".