163906091 has 2 divisors, whose sum is σ = 163906092. Its totient is φ = 163906090.

The previous prime is 163906087. The next prime is 163906139. The reversal of 163906091 is 190609361.

It is a weak prime.

It is an emirp because it is prime and its reverse (190609361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163906091 - 2² = 163906087 is a prime.

It is not a weakly prime, because it can be changed into another prime (163906081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81953045 + 81953046.

It is an arithmetic number, because the mean of its divisors is an integer number (81953046).

Almost surely, 2^163906091 is an apocalyptic number.

163906091 is a deficient number, since it is larger than the sum of its proper divisors (1).

163906091 is an equidigital number, since it uses as much as digits as its factorization.

163906091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 163906091 is about 12802.5814193857. The cubic root of 163906091 is about 547.2658698816.

The spelling of 163906091 in words is "one hundred sixty-three million, nine hundred six thousand, ninety-one".