164138909 has 4 divisors (see below), whose sum is σ = 179060640. Its totient is φ = 149217180.

The previous prime is 164138903. The next prime is 164138911. The reversal of 164138909 is 909831461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164138909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164138903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7460849 + ... + 7460870.

It is an arithmetic number, because the mean of its divisors is an integer number (44765160).

Almost surely, 2^164138909 is an apocalyptic number.

It is an amenable number.

164138909 is a deficient number, since it is larger than the sum of its proper divisors (14921731).

164138909 is a wasteful number, since it uses less digits than its factorization.

164138909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14921730.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 164138909 is about 12811.6708121931. The cubic root of 164138909 is about 547.5248658806.

The spelling of 164138909 in words is "one hundred sixty-four million, one hundred thirty-eight thousand, nine hundred nine".