164128369 has 4 divisors (see below), whose sum is σ = 166819060. Its totient is φ = 161437680.

The previous prime is 164128343. The next prime is 164128379. The reversal of 164128369 is 963821461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 963821461 = 1619 ⋅595319.

It can be written as a sum of positive squares in 2 ways, for example, as 3168400 + 160959969 = 1780^2 + 12687^2 .

It is a cyclic number.

It is not a de Polignac number, because 164128369 - 2⁷ = 164128241 is a prime.

It is a super-2 number, since 2×164128369² = 53876243021200322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164128379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1345254 + ... + 1345375.

It is an arithmetic number, because the mean of its divisors is an integer number (41704765).

Almost surely, 2^164128369 is an apocalyptic number.

It is an amenable number.

164128369 is a deficient number, since it is larger than the sum of its proper divisors (2690691).

164128369 is an equidigital number, since it uses as much as digits as its factorization.

164128369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2690690.

The product of its digits is 62208, while the sum is 40.

The square root of 164128369 is about 12811.2594618952. The cubic root of 164128369 is about 547.5131460602.

The spelling of 164128369 in words is "one hundred sixty-four million, one hundred twenty-eight thousand, three hundred sixty-nine".