163978841 has 12 divisors (see below), whose sum is σ = 178040700. Its totient is φ = 150958080.

The previous prime is 163978819. The next prime is 163978849. The reversal of 163978841 is 148879361.

163978841 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 11703241 + 152275600 = 3421^2 + 12340^2 .

It is a de Polignac number, because none of the positive numbers 2^k-163978841 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163978849) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74801 + ... + 76961.

It is an arithmetic number, because the mean of its divisors is an integer number (14836725).

Almost surely, 2^163978841 is an apocalyptic number.

It is an amenable number.

163978841 is a deficient number, since it is larger than the sum of its proper divisors (14061859).

163978841 is a wasteful number, since it uses less digits than its factorization.

163978841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2636 (or 2623 counting only the distinct ones).

The product of its digits is 290304, while the sum is 47.

The square root of 163978841 is about 12805.4223280609. The cubic root of 163978841 is about 547.3468262040.

The spelling of 163978841 in words is "one hundred sixty-three million, nine hundred seventy-eight thousand, eight hundred forty-one".