128266199 has 2 divisors, whose sum is σ = 128266200. Its totient is φ = 128266198.

The previous prime is 128266157. The next prime is 128266211. The reversal of 128266199 is 991662821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128266199 - 2¹⁶ = 128200663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128266129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64133099 + 64133100.

It is an arithmetic number, because the mean of its divisors is an integer number (64133100).

Almost surely, 2^128266199 is an apocalyptic number.

128266199 is a deficient number, since it is larger than the sum of its proper divisors (1).

128266199 is an equidigital number, since it uses as much as digits as its factorization.

128266199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 44.

The square root of 128266199 is about 11325.4668336453. The cubic root of 128266199 is about 504.3175423441.

The spelling of 128266199 in words is "one hundred twenty-eight million, two hundred sixty-six thousand, one hundred ninety-nine".