128344811 has 4 divisors (see below), whose sum is σ = 146679792. Its totient is φ = 110009832.

The previous prime is 128344771. The next prime is 128344813. The reversal of 128344811 is 118443821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118443821 = 1201 ⋅98621.

It is a cyclic number.

It is not a de Polignac number, because 128344811 - 2²⁶ = 61235947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128344813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9167480 + ... + 9167493.

It is an arithmetic number, because the mean of its divisors is an integer number (36669948).

Almost surely, 2^128344811 is an apocalyptic number.

128344811 is a deficient number, since it is larger than the sum of its proper divisors (18334981).

128344811 is an equidigital number, since it uses as much as digits as its factorization.

128344811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18334980.

The product of its digits is 6144, while the sum is 32.

The square root of 128344811 is about 11328.9368874577. The cubic root of 128344811 is about 504.4205502927.

The spelling of 128344811 in words is "one hundred twenty-eight million, three hundred forty-four thousand, eight hundred eleven".