128934791 has 4 divisors (see below), whose sum is σ = 132079584. Its totient is φ = 125790000.

The previous prime is 128934787. The next prime is 128934811. The reversal of 128934791 is 197439821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 197439821 = 67 ⋅2946863.

It is a cyclic number.

It is not a de Polignac number, because 128934791 - 2² = 128934787 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 (128934721) 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 3 ways as a sum of consecutive naturals, for example, 1572335 + ... + 1572416.

It is an arithmetic number, because the mean of its divisors is an integer number (33019896).

Almost surely, 2^128934791 is an apocalyptic number.

128934791 is a deficient number, since it is larger than the sum of its proper divisors (3144793).

128934791 is an equidigital number, since it uses as much as digits as its factorization.

128934791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3144792.

The product of its digits is 108864, while the sum is 44.

The square root of 128934791 is about 11354.9456625736. The cubic root of 128934791 is about 505.1922817761.

The spelling of 128934791 in words is "one hundred twenty-eight million, nine hundred thirty-four thousand, seven hundred ninety-one".