128961133 has 8 divisors (see below), whose sum is σ = 156053952. Its totient is φ = 104035776.

The previous prime is 128961127. The next prime is 128961149. The reversal of 128961133 is 331169821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128961133 - 2²¹ = 126863981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128962133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541735 + ... + 541972.

It is an arithmetic number, because the mean of its divisors is an integer number (19506744).

Almost surely, 2^128961133 is an apocalyptic number.

It is an amenable number.

128961133 is a deficient number, since it is larger than the sum of its proper divisors (27092819).

128961133 is a wasteful number, since it uses less digits than its factorization.

128961133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083731.

The product of its digits is 7776, while the sum is 34.

The square root of 128961133 is about 11356.1055384317. The cubic root of 128961133 is about 505.2266838404.

The spelling of 128961133 in words is "one hundred twenty-eight million, nine hundred sixty-one thousand, one hundred thirty-three".