128045381 has 2 divisors, whose sum is σ = 128045382. Its totient is φ = 128045380.

The previous prime is 128045363. The next prime is 128045387. The reversal of 128045381 is 183540821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116424100 + 11621281 = 10790^2 + 3409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128045381 is a prime.

It is a super-2 number, since 2×128045381² = 32791239190870322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128045387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64022690 + 64022691.

It is an arithmetic number, because the mean of its divisors is an integer number (64022691).

Almost surely, 2^128045381 is an apocalyptic number.

It is an amenable number.

128045381 is a deficient number, since it is larger than the sum of its proper divisors (1).

128045381 is an equidigital number, since it uses as much as digits as its factorization.

128045381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 128045381 is about 11315.7138970548. The cubic root of 128045381 is about 504.0279717511.

The spelling of 128045381 in words is "one hundred twenty-eight million, forty-five thousand, three hundred eighty-one".