161443161 has 18 divisors (see below), whose sum is σ = 256324250. Its totient is φ = 97843680.

The previous prime is 161443157. The next prime is 161443189. The reversal of 161443161 is 161344161.

161443161 is a `hidden beast` number, since 1 + 61 + 443 + 161 = 666.

It can be written as a sum of positive squares in only one way, i.e., 120033936 + 41409225 = 10956^2 + 6435^2 .

It is not a de Polignac number, because 161443161 - 2² = 161443157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161443111) 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 17 ways as a sum of consecutive naturals, for example, 73036 + ... + 75213.

Almost surely, 2^161443161 is an apocalyptic number.

161443161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161443161 is a deficient number, since it is larger than the sum of its proper divisors (94881089).

161443161 is a wasteful number, since it uses less digits than its factorization.

161443161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148277 (or 148263 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 161443161 is about 12706.0285297964. The cubic root of 161443161 is about 544.5108660213.

It can be divided in two parts, 161443 and 161, that added together give a square (161604 = 402²).

The spelling of 161443161 in words is "one hundred sixty-one million, four hundred forty-three thousand, one hundred sixty-one".