128134949 has 2 divisors, whose sum is σ = 128134950. Its totient is φ = 128134948.

The previous prime is 128134939. The next prime is 128135011. The reversal of 128134949 is 949431821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67404100 + 60730849 = 8210^2 + 7793^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128134949 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128134939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64067474 + 64067475.

It is an arithmetic number, because the mean of its divisors is an integer number (64067475).

Almost surely, 2^128134949 is an apocalyptic number.

It is an amenable number.

128134949 is a deficient number, since it is larger than the sum of its proper divisors (1).

128134949 is an equidigital number, since it uses as much as digits as its factorization.

128134949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 41.

The square root of 128134949 is about 11319.6708874419. The cubic root of 128134949 is about 504.1454672172.

The spelling of 128134949 in words is "one hundred twenty-eight million, one hundred thirty-four thousand, nine hundred forty-nine".