164989509 has 4 divisors (see below), whose sum is σ = 219986016. Its totient is φ = 109993004.

The previous prime is 164989501. The next prime is 164989519. The reversal of 164989509 is 905989461.

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 not a de Polignac number, because 164989509 - 2³ = 164989501 is a prime.

It is a super-2 number, since 2×164989509² = 54443076160122162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164989501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27498249 + ... + 27498254.

It is an arithmetic number, because the mean of its divisors is an integer number (54996504).

Almost surely, 2^164989509 is an apocalyptic number.

It is an amenable number.

164989509 is a deficient number, since it is larger than the sum of its proper divisors (54996507).

164989509 is an equidigital number, since it uses as much as digits as its factorization.

164989509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54996506.

The product of its (nonzero) digits is 699840, while the sum is 51.

The square root of 164989509 is about 12844.8242105527. The cubic root of 164989509 is about 548.4690305311.

The spelling of 164989509 in words is "one hundred sixty-four million, nine hundred eighty-nine thousand, five hundred nine".