164494489 has 4 divisors (see below), whose sum is σ = 168940324. Its totient is φ = 160048656.

The previous prime is 164494487. The next prime is 164494493. The reversal of 164494489 is 984494461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 984494461 = 23 ⋅42804107.

It can be written as a sum of positive squares in 2 ways, for example, as 73616400 + 90878089 = 8580^2 + 9533^2 .

It is a cyclic number.

It is not a de Polignac number, because 164494489 - 2¹ = 164494487 is a prime.

It is a super-2 number, since 2×164494489² = 54116873822742242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164494487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2222862 + ... + 2222935.

It is an arithmetic number, because the mean of its divisors is an integer number (42235081).

Almost surely, 2^164494489 is an apocalyptic number.

It is an amenable number.

164494489 is a deficient number, since it is larger than the sum of its proper divisors (4445835).

164494489 is an equidigital number, since it uses as much as digits as its factorization.

164494489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4445834.

The product of its digits is 995328, while the sum is 49.

The square root of 164494489 is about 12825.5404954333. The cubic root of 164494489 is about 547.9199549646.

The spelling of 164494489 in words is "one hundred sixty-four million, four hundred ninety-four thousand, four hundred eighty-nine".