163387191 has 8 divisors (see below), whose sum is σ = 237654144. Its totient is φ = 99022520.

The previous prime is 163387177. The next prime is 163387199. The reversal of 163387191 is 191783361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163387191 - 2⁹ = 163386679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163387199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2475531 + ... + 2475596.

It is an arithmetic number, because the mean of its divisors is an integer number (29706768).

Almost surely, 2^163387191 is an apocalyptic number.

163387191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

163387191 is a deficient number, since it is larger than the sum of its proper divisors (74266953).

163387191 is a wasteful number, since it uses less digits than its factorization.

163387191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4951141.

The product of its digits is 27216, while the sum is 39.

The square root of 163387191 is about 12782.2999104230. The cubic root of 163387191 is about 546.6877411484.

The spelling of 163387191 in words is "one hundred sixty-three million, three hundred eighty-seven thousand, one hundred ninety-one".