128048909 has 2 divisors, whose sum is σ = 128048910. Its totient is φ = 128048908.

The previous prime is 128048887. The next prime is 128048917. The reversal of 128048909 is 909840821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127193284 + 855625 = 11278^2 + 925^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128048909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128048929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64024454 + 64024455.

It is an arithmetic number, because the mean of its divisors is an integer number (64024455).

Almost surely, 2^128048909 is an apocalyptic number.

It is an amenable number.

128048909 is a deficient number, since it is larger than the sum of its proper divisors (1).

128048909 is an equidigital number, since it uses as much as digits as its factorization.

128048909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 128048909 is about 11315.8697853943. The cubic root of 128048909 is about 504.0326008243.

The spelling of 128048909 in words is "one hundred twenty-eight million, forty-eight thousand, nine hundred nine".