128877641 has 2 divisors, whose sum is σ = 128877642. Its totient is φ = 128877640.

The previous prime is 128877601. The next prime is 128877647. The reversal of 128877641 is 146778821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106172416 + 22705225 = 10304^2 + 4765^2 .

It is a cyclic number.

It is not a de Polignac number, because 128877641 - 2¹⁰ = 128876617 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 128877592 and 128877601.

It is not a weakly prime, because it can be changed into another prime (128877647) 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, 64438820 + 64438821.

It is an arithmetic number, because the mean of its divisors is an integer number (64438821).

Almost surely, 2^128877641 is an apocalyptic number.

It is an amenable number.

128877641 is a deficient number, since it is larger than the sum of its proper divisors (1).

128877641 is an equidigital number, since it uses as much as digits as its factorization.

128877641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 150528, while the sum is 44.

The square root of 128877641 is about 11352.4288590592. The cubic root of 128877641 is about 505.1176290376.

The spelling of 128877641 in words is "one hundred twenty-eight million, eight hundred seventy-seven thousand, six hundred forty-one".