161443573 has 2 divisors, whose sum is σ = 161443574. Its totient is φ = 161443572.

The previous prime is 161443559. The next prime is 161443591. The reversal of 161443573 is 375344161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127080529 + 34363044 = 11273^2 + 5862^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161443573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161443553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80721786 + 80721787.

It is an arithmetic number, because the mean of its divisors is an integer number (80721787).

Almost surely, 2^161443573 is an apocalyptic number.

It is an amenable number.

161443573 is a deficient number, since it is larger than the sum of its proper divisors (1).

161443573 is an equidigital number, since it uses as much as digits as its factorization.

161443573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 34.

The square root of 161443573 is about 12706.0447425625. The cubic root of 161443573 is about 544.5113292148.

The spelling of 161443573 in words is "one hundred sixty-one million, four hundred forty-three thousand, five hundred seventy-three".