163339991 has 2 divisors, whose sum is σ = 163339992. Its totient is φ = 163339990.

The previous prime is 163339963. The next prime is 163340003. The reversal of 163339991 is 199933361.

It is a strong prime.

It is an emirp because it is prime and its reverse (199933361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163339991 - 2¹⁸ = 163077847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163339901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81669995 + 81669996.

It is an arithmetic number, because the mean of its divisors is an integer number (81669996).

Almost surely, 2^163339991 is an apocalyptic number.

163339991 is a deficient number, since it is larger than the sum of its proper divisors (1).

163339991 is an equidigital number, since it uses as much as digits as its factorization.

163339991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 118098, while the sum is 44.

The square root of 163339991 is about 12780.4534739578. The cubic root of 163339991 is about 546.6350929034.

The spelling of 163339991 in words is "one hundred sixty-three million, three hundred thirty-nine thousand, nine hundred ninety-one".