161441773 has 2 divisors, whose sum is σ = 161441774. Its totient is φ = 161441772.

The previous prime is 161441771. The next prime is 161441779. The reversal of 161441773 is 377144161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135908964 + 25532809 = 11658^2 + 5053^2 .

It is an emirp because it is prime and its reverse (377144161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161441773 - 2¹ = 161441771 is a prime.

Together with 161441771, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161441771) 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, 80720886 + 80720887.

It is an arithmetic number, because the mean of its divisors is an integer number (80720887).

Almost surely, 2^161441773 is an apocalyptic number.

It is an amenable number.

161441773 is a deficient number, since it is larger than the sum of its proper divisors (1).

161441773 is an equidigital number, since it uses as much as digits as its factorization.

161441773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 34.

The square root of 161441773 is about 12705.9739099370. The cubic root of 161441773 is about 544.5093055480.

The spelling of 161441773 in words is "one hundred sixty-one million, four hundred forty-one thousand, seven hundred seventy-three".