128569601 has 2 divisors, whose sum is σ = 128569602. Its totient is φ = 128569600.

The previous prime is 128569591. The next prime is 128569603. The reversal of 128569601 is 106965821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108139201 + 20430400 = 10399^2 + 4520^2 .

It is an emirp because it is prime and its reverse (106965821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128569601 - 2¹⁸ = 128307457 is a prime.

Together with 128569603, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128569603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64284800 + 64284801.

It is an arithmetic number, because the mean of its divisors is an integer number (64284801).

Almost surely, 2^128569601 is an apocalyptic number.

It is an amenable number.

128569601 is a deficient number, since it is larger than the sum of its proper divisors (1).

128569601 is an equidigital number, since it uses as much as digits as its factorization.

128569601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 128569601 is about 11338.8536016654. The cubic root of 128569601 is about 504.7148682855.

The spelling of 128569601 in words is "one hundred twenty-eight million, five hundred sixty-nine thousand, six hundred one".