164909 has 4 divisors (see below), whose sum is σ = 169404. Its totient is φ = 160416.

The previous prime is 164893. The next prime is 164911. The reversal of 164909 is 909461.

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

It can be written as a sum of positive squares in 2 ways, for example, as 133225 + 31684 = 365^2 + 178^2 .

It is a cyclic number.

It is not a de Polignac number, because 164909 - 2⁴ = 164893 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2192 + ... + 2265.

It is an arithmetic number, because the mean of its divisors is an integer number (42351).

2¹⁶⁴⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

164909 is a deficient number, since it is larger than the sum of its proper divisors (4495).

164909 is an equidigital number, since it uses as much as digits as its factorization.

164909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4494.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 164909 is about 406.0898915265. The cubic root of 164909 is about 54.8379804904.

The spelling of 164909 in words is "one hundred sixty-four thousand, nine hundred nine".