128761117 has 2 divisors, whose sum is σ = 128761118. Its totient is φ = 128761116.

The previous prime is 128761103. The next prime is 128761141. The reversal of 128761117 is 711167821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74753316 + 54007801 = 8646^2 + 7349^2 .

It is a cyclic number.

It is not a de Polignac number, because 128761117 - 2¹¹ = 128759069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128761177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64380558 + 64380559.

It is an arithmetic number, because the mean of its divisors is an integer number (64380559).

Almost surely, 2^128761117 is an apocalyptic number.

It is an amenable number.

128761117 is a deficient number, since it is larger than the sum of its proper divisors (1).

128761117 is an equidigital number, since it uses as much as digits as its factorization.

128761117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 34.

The square root of 128761117 is about 11347.2955808862. The cubic root of 128761117 is about 504.9653500390.

The spelling of 128761117 in words is "one hundred twenty-eight million, seven hundred sixty-one thousand, one hundred seventeen".