163999841 has 2 divisors, whose sum is σ = 163999842. Its totient is φ = 163999840.

The previous prime is 163999837. The next prime is 163999883. The reversal of 163999841 is 148999361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161391616 + 2608225 = 12704^2 + 1615^2 .

It is a cyclic number.

It is not a de Polignac number, because 163999841 - 2² = 163999837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163999841.

It is not a weakly prime, because it can be changed into another prime (163999141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81999920 + 81999921.

It is an arithmetic number, because the mean of its divisors is an integer number (81999921).

Almost surely, 2^163999841 is an apocalyptic number.

It is an amenable number.

163999841 is a deficient number, since it is larger than the sum of its proper divisors (1).

163999841 is an equidigital number, since it uses as much as digits as its factorization.

163999841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 50.

The square root of 163999841 is about 12806.2422669572. The cubic root of 163999841 is about 547.3701905857.

The spelling of 163999841 in words is "one hundred sixty-three million, nine hundred ninety-nine thousand, eight hundred forty-one".