161325445 has 4 divisors (see below), whose sum is σ = 193590540. Its totient is φ = 129060352.

The previous prime is 161325443. The next prime is 161325449. The reversal of 161325445 is 544523161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16532356 + 144793089 = 4066^2 + 12033^2 .

It is a cyclic number.

It is not a de Polignac number, because 161325445 - 2¹ = 161325443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161325443) 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, 16132540 + ... + 16132549.

It is an arithmetic number, because the mean of its divisors is an integer number (48397635).

Almost surely, 2^161325445 is an apocalyptic number.

It is an amenable number.

161325445 is a deficient number, since it is larger than the sum of its proper divisors (32265095).

161325445 is an equidigital number, since it uses as much as digits as its factorization.

161325445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32265094.

The product of its digits is 14400, while the sum is 31.

The square root of 161325445 is about 12701.3953957823. The cubic root of 161325445 is about 544.3784907921.

The spelling of 161325445 in words is "one hundred sixty-one million, three hundred twenty-five thousand, four hundred forty-five".