128158117 has 2 divisors, whose sum is σ = 128158118. Its totient is φ = 128158116.

The previous prime is 128158111. The next prime is 128158127. The reversal of 128158117 is 711851821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115584001 + 12574116 = 10751^2 + 3546^2 .

It is a cyclic number.

It is not a de Polignac number, because 128158117 - 2³ = 128158109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128158111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64079058 + 64079059.

It is an arithmetic number, because the mean of its divisors is an integer number (64079059).

Almost surely, 2^128158117 is an apocalyptic number.

It is an amenable number.

128158117 is a deficient number, since it is larger than the sum of its proper divisors (1).

128158117 is an equidigital number, since it uses as much as digits as its factorization.

128158117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4480, while the sum is 34.

The square root of 128158117 is about 11320.6941924954. The cubic root of 128158117 is about 504.1758501283.

The spelling of 128158117 in words is "one hundred twenty-eight million, one hundred fifty-eight thousand, one hundred seventeen".