163343491 has 2 divisors, whose sum is σ = 163343492. Its totient is φ = 163343490.

The previous prime is 163343489. The next prime is 163343519. The reversal of 163343491 is 194343361.

163343491 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 is an emirp because it is prime and its reverse (194343361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163343491 - 2¹ = 163343489 is a prime.

Together with 163343489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (163343431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81671745 + 81671746.

It is an arithmetic number, because the mean of its divisors is an integer number (81671746).

Almost surely, 2^163343491 is an apocalyptic number.

163343491 is a deficient number, since it is larger than the sum of its proper divisors (1).

163343491 is an equidigital number, since it uses as much as digits as its factorization.

163343491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 34.

The square root of 163343491 is about 12780.5904010730. The cubic root of 163343491 is about 546.6389972528.

The spelling of 163343491 in words is "one hundred sixty-three million, three hundred forty-three thousand, four hundred ninety-one".