128182169 has 4 divisors (see below), whose sum is σ = 128505444. Its totient is φ = 127858896.

The previous prime is 128182157. The next prime is 128182181. The reversal of 128182169 is 961281821.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (128182157) and next prime (128182181).

It can be written as a sum of positive squares in 2 ways, for example, as 57957769 + 70224400 = 7613^2 + 8380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128182169 is a prime.

It is a super-2 number, since 2×128182169² = 32861336899089122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128182139) 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 in 3 ways as a sum of consecutive naturals, for example, 161042 + ... + 161835.

It is an arithmetic number, because the mean of its divisors is an integer number (32126361).

Almost surely, 2^128182169 is an apocalyptic number.

It is an amenable number.

128182169 is a deficient number, since it is larger than the sum of its proper divisors (323275).

128182169 is an equidigital number, since it uses as much as digits as its factorization.

128182169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323274.

The product of its digits is 13824, while the sum is 38.

The square root of 128182169 is about 11321.7564450045. The cubic root of 128182169 is about 504.2073884585.

The spelling of 128182169 in words is "one hundred twenty-eight million, one hundred eighty-two thousand, one hundred sixty-nine".