163444861 has 2 divisors, whose sum is σ = 163444862. Its totient is φ = 163444860.

The previous prime is 163444847. The next prime is 163444871. The reversal of 163444861 is 168444361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124768900 + 38675961 = 11170^2 + 6219^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163444861 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163444861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163444871) 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, 81722430 + 81722431.

It is an arithmetic number, because the mean of its divisors is an integer number (81722431).

Almost surely, 2^163444861 is an apocalyptic number.

It is an amenable number.

163444861 is a deficient number, since it is larger than the sum of its proper divisors (1).

163444861 is an equidigital number, since it uses as much as digits as its factorization.

163444861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 37.

The square root of 163444861 is about 12784.5555652123. Note that the first 4 decimals coincide. The cubic root of 163444861 is about 546.7520541731.

The spelling of 163444861 in words is "one hundred sixty-three million, four hundred forty-four thousand, eight hundred sixty-one".