169444745 has 4 divisors (see below), whose sum is σ = 203333700. Its totient is φ = 135555792.

The previous prime is 169444739. The next prime is 169444747. The reversal of 169444745 is 547444961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 547444961 = 7 ⋅78206423.

It can be written as a sum of positive squares in 2 ways, for example, as 98565184 + 70879561 = 9928^2 + 8419^2 .

It is a cyclic number.

It is not a de Polignac number, because 169444745 - 2¹⁶ = 169379209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 169444696 and 169444705.

It is not an unprimeable number, because it can be changed into a prime (169444747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16944470 + ... + 16944479.

It is an arithmetic number, because the mean of its divisors is an integer number (50833425).

Almost surely, 2^169444745 is an apocalyptic number.

It is an amenable number.

169444745 is a deficient number, since it is larger than the sum of its proper divisors (33888955).

169444745 is an equidigital number, since it uses as much as digits as its factorization.

169444745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33888954.

The product of its digits is 483840, while the sum is 44.

The square root of 169444745 is about 13017.0943378313. The cubic root of 169444745 is about 553.3620456948.

The spelling of 169444745 in words is "one hundred sixty-nine million, four hundred forty-four thousand, seven hundred forty-five".