128555461 has 2 divisors, whose sum is σ = 128555462. Its totient is φ = 128555460.

The previous prime is 128555437. The next prime is 128555477. The reversal of 128555461 is 164555821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84916225 + 43639236 = 9215^2 + 6606^2 .

It is an emirp because it is prime and its reverse (164555821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128555461 - 2¹³ = 128547269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128555461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128555491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64277730 + 64277731.

It is an arithmetic number, because the mean of its divisors is an integer number (64277731).

Almost surely, 2^128555461 is an apocalyptic number.

It is an amenable number.

128555461 is a deficient number, since it is larger than the sum of its proper divisors (1).

128555461 is an equidigital number, since it uses as much as digits as its factorization.

128555461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48000, while the sum is 37.

The square root of 128555461 is about 11338.2300646970. The cubic root of 128555461 is about 504.6963648709.

The spelling of 128555461 in words is "one hundred twenty-eight million, five hundred fifty-five thousand, four hundred sixty-one".