128236169 has 2 divisors, whose sum is σ = 128236170. Its totient is φ = 128236168.

The previous prime is 128236139. The next prime is 128236177. The reversal of 128236169 is 961632821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66015625 + 62220544 = 8125^2 + 7888^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128236169 is a prime.

It is a super-2 number, since 2×128236169² = 32889030079593122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128236139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64118084 + 64118085.

It is an arithmetic number, because the mean of its divisors is an integer number (64118085).

Almost surely, 2^128236169 is an apocalyptic number.

It is an amenable number.

128236169 is a deficient number, since it is larger than the sum of its proper divisors (1).

128236169 is an equidigital number, since it uses as much as digits as its factorization.

128236169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 128236169 is about 11324.1409828737. The cubic root of 128236169 is about 504.2781819152.

The spelling of 128236169 in words is "one hundred twenty-eight million, two hundred thirty-six thousand, one hundred sixty-nine".