164978449 has 4 divisors (see below), whose sum is σ = 169437364. Its totient is φ = 160519536.

The previous prime is 164978447. The next prime is 164978479. The reversal of 164978449 is 944879461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 944879461 = 103 ⋅9173587.

It can be written as a sum of positive squares in 2 ways, for example, as 68310225 + 96668224 = 8265^2 + 9832^2 .

It is a cyclic number.

It is not a de Polignac number, because 164978449 - 2¹ = 164978447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 164978396 and 164978405.

It is not an unprimeable number, because it can be changed into a prime (164978447) 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, 2229402 + ... + 2229475.

It is an arithmetic number, because the mean of its divisors is an integer number (42359341).

Almost surely, 2^164978449 is an apocalyptic number.

It is an amenable number.

164978449 is a deficient number, since it is larger than the sum of its proper divisors (4458915).

164978449 is an equidigital number, since it uses as much as digits as its factorization.

164978449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4458914.

The product of its digits is 1741824, while the sum is 52.

The square root of 164978449 is about 12844.3936797344. The cubic root of 164978449 is about 548.4567747963.

The spelling of 164978449 in words is "one hundred sixty-four million, nine hundred seventy-eight thousand, four hundred forty-nine".