164000009 has 4 divisors (see below), whose sum is σ = 164722704. Its totient is φ = 163277316.

The previous prime is 163999991. The next prime is 164000047. The reversal of 164000009 is 900000461.

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, and also an emirpimes, since its reverse is a distinct semiprime: 900000461 = 26501 ⋅33961.

It is a cyclic number.

It is not a de Polignac number, because 164000009 - 2⁸ = 163999753 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (164000059) 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, 361007 + ... + 361460.

It is an arithmetic number, because the mean of its divisors is an integer number (41180676).

Almost surely, 2^164000009 is an apocalyptic number.

It is an amenable number.

164000009 is a deficient number, since it is larger than the sum of its proper divisors (722695).

164000009 is an equidigital number, since it uses as much as digits as its factorization.

164000009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722694.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 164000009 is about 12806.2488262567. The cubic root of 164000009 is about 547.3703774927.

The spelling of 164000009 in words is "one hundred sixty-four million, nine", and thus it is an aban number.