128731241 has 2 divisors, whose sum is σ = 128731242. Its totient is φ = 128731240.

The previous prime is 128731237. The next prime is 128731249. The reversal of 128731241 is 142137821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121992025 + 6739216 = 11045^2 + 2596^2 .

It is a cyclic number.

It is not a de Polignac number, because 128731241 - 2² = 128731237 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128731249) 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, 64365620 + 64365621.

It is an arithmetic number, because the mean of its divisors is an integer number (64365621).

Almost surely, 2^128731241 is an apocalyptic number.

It is an amenable number.

128731241 is a deficient number, since it is larger than the sum of its proper divisors (1).

128731241 is an equidigital number, since it uses as much as digits as its factorization.

128731241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 29.

The square root of 128731241 is about 11345.9790674935. The cubic root of 128731241 is about 504.9262918924.

The spelling of 128731241 in words is "one hundred twenty-eight million, seven hundred thirty-one thousand, two hundred forty-one".