164868909 has 16 divisors (see below), whose sum is σ = 235193280. Its totient is φ = 102418560.

The previous prime is 164868889. The next prime is 164868919. The reversal of 164868909 is 909868461.

It is a happy number.

It is not a de Polignac number, because 164868909 - 2²¹ = 162771757 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164868919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20232 + ... + 27185.

It is an arithmetic number, because the mean of its divisors is an integer number (14699580).

Almost surely, 2^164868909 is an apocalyptic number.

164868909 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

164868909 is a deficient number, since it is larger than the sum of its proper divisors (70324371).

164868909 is a wasteful number, since it uses less digits than its factorization.

164868909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47500.

The product of its (nonzero) digits is 746496, while the sum is 51.

The square root of 164868909 is about 12840.1288544936. The cubic root of 164868909 is about 548.3353624604.

The spelling of 164868909 in words is "one hundred sixty-four million, eight hundred sixty-eight thousand, nine hundred nine".