164539809 has 32 divisors (see below), whose sum is σ = 284528640. Its totient is φ = 92017296.

The previous prime is 164539783. The next prime is 164539841. The reversal of 164539809 is 908935461.

It is a happy number.

It is not a de Polignac number, because 164539809 - 2⁸ = 164539553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (164539409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 379 + ... + 18144.

It is an arithmetic number, because the mean of its divisors is an integer number (8891520).

Almost surely, 2^164539809 is an apocalyptic number.

It is an amenable number.

164539809 is a deficient number, since it is larger than the sum of its proper divisors (119988831).

164539809 is a wasteful number, since it uses less digits than its factorization.

164539809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18586 (or 18580 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 164539809 is about 12827.3071608970. The cubic root of 164539809 is about 547.9702696233.

It can be divided in two parts, 16453 and 9809, that added together give a palindrome (26262).

The spelling of 164539809 in words is "one hundred sixty-four million, five hundred thirty-nine thousand, eight hundred nine".