128961011 has 2 divisors, whose sum is σ = 128961012. Its totient is φ = 128961010.

The previous prime is 128960987. The next prime is 128961013. The reversal of 128961011 is 110169821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128961011 is a prime.

Together with 128961013, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128961013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64480505 + 64480506.

It is an arithmetic number, because the mean of its divisors is an integer number (64480506).

Almost surely, 2^128961011 is an apocalyptic number.

128961011 is a deficient number, since it is larger than the sum of its proper divisors (1).

128961011 is an equidigital number, since it uses as much as digits as its factorization.

128961011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 29.

The square root of 128961011 is about 11356.1001668707. The cubic root of 128961011 is about 505.2265245220.

The spelling of 128961011 in words is "one hundred twenty-eight million, nine hundred sixty-one thousand, eleven".