128699699 has 2 divisors, whose sum is σ = 128699700. Its totient is φ = 128699698.

The previous prime is 128699687. The next prime is 128699729. The reversal of 128699699 is 996996821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128699699 - 2⁸ = 128699443 is a prime.

It is a super-2 number, since 2×128699699² = 33127225045381202, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128699609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64349849 + 64349850.

It is an arithmetic number, because the mean of its divisors is an integer number (64349850).

Almost surely, 2^128699699 is an apocalyptic number.

128699699 is a deficient number, since it is larger than the sum of its proper divisors (1).

128699699 is an equidigital number, since it uses as much as digits as its factorization.

128699699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3779136, while the sum is 59.

The square root of 128699699 is about 11344.5889744847. The cubic root of 128699699 is about 504.8850491557.

The spelling of 128699699 in words is "one hundred twenty-eight million, six hundred ninety-nine thousand, six hundred ninety-nine".