128540941 has 2 divisors, whose sum is σ = 128540942. Its totient is φ = 128540940.

The previous prime is 128540939. The next prime is 128541001. The reversal of 128540941 is 149045821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126450025 + 2090916 = 11245^2 + 1446^2 .

It is an emirp because it is prime and its reverse (149045821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128540941 - 2¹ = 128540939 is a prime.

Together with 128540939, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 128540897 and 128540906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128540641) 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, 64270470 + 64270471.

It is an arithmetic number, because the mean of its divisors is an integer number (64270471).

Almost surely, 2^128540941 is an apocalyptic number.

It is an amenable number.

128540941 is a deficient number, since it is larger than the sum of its proper divisors (1).

128540941 is an equidigital number, since it uses as much as digits as its factorization.

128540941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 128540941 is about 11337.5897350363. The cubic root of 128540941 is about 504.6773627814.

The spelling of 128540941 in words is "one hundred twenty-eight million, five hundred forty thousand, nine hundred forty-one".