128522561 has 2 divisors, whose sum is σ = 128522562. Its totient is φ = 128522560.

The previous prime is 128522501. The next prime is 128522579. The reversal of 128522561 is 165225821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66994225 + 61528336 = 8185^2 + 7844^2 .

It is a cyclic number.

It is not a de Polignac number, because 128522561 - 2²² = 124328257 is a prime.

It is not a weakly prime, because it can be changed into another prime (128522501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64261280 + 64261281.

It is an arithmetic number, because the mean of its divisors is an integer number (64261281).

Almost surely, 2^128522561 is an apocalyptic number.

It is an amenable number.

128522561 is a deficient number, since it is larger than the sum of its proper divisors (1).

128522561 is an equidigital number, since it uses as much as digits as its factorization.

128522561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 32.

The square root of 128522561 is about 11336.7791281298. The cubic root of 128522561 is about 504.6533071200.

The spelling of 128522561 in words is "one hundred twenty-eight million, five hundred twenty-two thousand, five hundred sixty-one".