164509523 has 4 divisors (see below), whose sum is σ = 167297880. Its totient is φ = 161721168.

The previous prime is 164509481. The next prime is 164509549. The reversal of 164509523 is 325905461.

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

It is a cyclic number.

It is not a de Polignac number, because 164509523 - 2¹⁰ = 164508499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164509573) 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, 1394090 + ... + 1394207.

It is an arithmetic number, because the mean of its divisors is an integer number (41824470).

Almost surely, 2^164509523 is an apocalyptic number.

164509523 is a deficient number, since it is larger than the sum of its proper divisors (2788357).

164509523 is an equidigital number, since it uses as much as digits as its factorization.

164509523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2788356.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 164509523 is about 12826.1265781997. The cubic root of 164509523 is about 547.9366468666.

The spelling of 164509523 in words is "one hundred sixty-four million, five hundred nine thousand, five hundred twenty-three".