128163913 has 2 divisors, whose sum is σ = 128163914. Its totient is φ = 128163912.

The previous prime is 128163883. The next prime is 128163923. The reversal of 128163913 is 319361821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122146704 + 6017209 = 11052^2 + 2453^2 .

It is a cyclic number.

It is not a de Polignac number, because 128163913 - 2⁹ = 128163401 is a prime.

It is not a weakly prime, because it can be changed into another prime (128163923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64081956 + 64081957.

It is an arithmetic number, because the mean of its divisors is an integer number (64081957).

Almost surely, 2^128163913 is an apocalyptic number.

It is an amenable number.

128163913 is a deficient number, since it is larger than the sum of its proper divisors (1).

128163913 is an equidigital number, since it uses as much as digits as its factorization.

128163913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 34.

The square root of 128163913 is about 11320.9501809698. The cubic root of 128163913 is about 504.1834505291.

The spelling of 128163913 in words is "one hundred twenty-eight million, one hundred sixty-three thousand, nine hundred thirteen".