163956841 has 2 divisors, whose sum is σ = 163956842. Its totient is φ = 163956840.

The previous prime is 163956817. The next prime is 163956847. The reversal of 163956841 is 148659361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116553616 + 47403225 = 10796^2 + 6885^2 .

It is a cyclic number.

It is not a de Polignac number, because 163956841 - 2⁷ = 163956713 is a prime.

It is not a weakly prime, because it can be changed into another prime (163956847) 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 as a sum of consecutive naturals, namely, 81978420 + 81978421.

It is an arithmetic number, because the mean of its divisors is an integer number (81978421).

Almost surely, 2^163956841 is an apocalyptic number.

It is an amenable number.

163956841 is a deficient number, since it is larger than the sum of its proper divisors (1).

163956841 is an equidigital number, since it uses as much as digits as its factorization.

163956841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 43.

The square root of 163956841 is about 12804.5632881407. The cubic root of 163956841 is about 547.3223470930.

The spelling of 163956841 in words is "one hundred sixty-three million, nine hundred fifty-six thousand, eight hundred forty-one".