163981933 has 2 divisors, whose sum is σ = 163981934. Its totient is φ = 163981932.

The previous prime is 163981931. The next prime is 163981957. The reversal of 163981933 is 339189361.

It is a happy number.

163981933 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140138244 + 23843689 = 11838^2 + 4883^2 .

It is a cyclic number.

It is not a de Polignac number, because 163981933 - 2¹ = 163981931 is a prime.

Together with 163981931, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 163981933.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163981931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81990966 + 81990967.

It is an arithmetic number, because the mean of its divisors is an integer number (81990967).

Almost surely, 2^163981933 is an apocalyptic number.

It is an amenable number.

163981933 is a deficient number, since it is larger than the sum of its proper divisors (1).

163981933 is an equidigital number, since it uses as much as digits as its factorization.

163981933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 43.

The square root of 163981933 is about 12805.5430575981. The cubic root of 163981933 is about 547.3502664563.

The spelling of 163981933 in words is "one hundred sixty-three million, nine hundred eighty-one thousand, nine hundred thirty-three".