161244445 has 4 divisors (see below), whose sum is σ = 193493340. Its totient is φ = 128995552.

The previous prime is 161244403. The next prime is 161244449. The reversal of 161244445 is 544442161.

161244445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544442161 = 37 ⋅14714653.

It can be written as a sum of positive squares in 2 ways, for example, as 124144164 + 37100281 = 11142^2 + 6091^2 .

It is a cyclic number.

It is not a de Polignac number, because 161244445 - 2¹⁷ = 161113373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161244449) 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, 16124440 + ... + 16124449.

It is an arithmetic number, because the mean of its divisors is an integer number (48373335).

Almost surely, 2^161244445 is an apocalyptic number.

It is an amenable number.

161244445 is a deficient number, since it is larger than the sum of its proper divisors (32248895).

161244445 is an equidigital number, since it uses as much as digits as its factorization.

161244445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32248894.

The product of its digits is 15360, while the sum is 31.

The square root of 161244445 is about 12698.2063694051. The cubic root of 161244445 is about 544.2873664200.

The spelling of 161244445 in words is "one hundred sixty-one million, two hundred forty-four thousand, four hundred forty-five".