128489957 has 2 divisors, whose sum is σ = 128489958. Its totient is φ = 128489956.

The previous prime is 128489953. The next prime is 128489969. The reversal of 128489957 is 759984821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79405921 + 49084036 = 8911^2 + 7006^2 .

It is an emirp because it is prime and its reverse (759984821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128489957 - 2² = 128489953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128489899 and 128489908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128489953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64244978 + 64244979.

It is an arithmetic number, because the mean of its divisors is an integer number (64244979).

Almost surely, 2^128489957 is an apocalyptic number.

It is an amenable number.

128489957 is a deficient number, since it is larger than the sum of its proper divisors (1).

128489957 is an equidigital number, since it uses as much as digits as its factorization.

128489957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 53.

The square root of 128489957 is about 11335.3410623589. The cubic root of 128489957 is about 504.6106295080.

The spelling of 128489957 in words is "one hundred twenty-eight million, four hundred eighty-nine thousand, nine hundred fifty-seven".