128448461 has 2 divisors, whose sum is σ = 128448462. Its totient is φ = 128448460.

The previous prime is 128448427. The next prime is 128448499. The reversal of 128448461 is 164844821.

It is an a-pointer prime, because the next prime (128448499) can be obtained adding 128448461 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94692361 + 33756100 = 9731^2 + 5810^2 .

It is a cyclic number.

It is not a de Polignac number, because 128448461 - 2¹⁰ = 128447437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128448361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64224230 + 64224231.

It is an arithmetic number, because the mean of its divisors is an integer number (64224231).

Almost surely, 2^128448461 is an apocalyptic number.

128448461 is the 5069-th centered decagonal number.

It is an amenable number.

128448461 is a deficient number, since it is larger than the sum of its proper divisors (1).

128448461 is an equidigital number, since it uses as much as digits as its factorization.

128448461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49152, while the sum is 38.

The square root of 128448461 is about 11333.5105329284. The cubic root of 128448461 is about 504.5563021045.

The spelling of 128448461 in words is "one hundred twenty-eight million, four hundred forty-eight thousand, four hundred sixty-one".