128547961 has 16 divisors (see below), whose sum is σ = 134830080. Its totient is φ = 122461200.

The previous prime is 128547929. The next prime is 128547971. The reversal of 128547961 is 169745821.

It is a cyclic number.

It is not a de Polignac number, because 128547961 - 2⁵ = 128547929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128547971) 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 in 15 ways as a sum of consecutive naturals, for example, 418570 + ... + 418876.

It is an arithmetic number, because the mean of its divisors is an integer number (8426880).

Almost surely, 2^128547961 is an apocalyptic number.

It is an amenable number.

128547961 is a deficient number, since it is larger than the sum of its proper divisors (6282119).

128547961 is a wasteful number, since it uses less digits than its factorization.

128547961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564.

The product of its digits is 120960, while the sum is 43.

The square root of 128547961 is about 11337.8993204209. The cubic root of 128547961 is about 504.6865499207.

The spelling of 128547961 in words is "one hundred twenty-eight million, five hundred forty-seven thousand, nine hundred sixty-one".