163791117 has 12 divisors (see below), whose sum is σ = 270385440. Its totient is φ = 93594888.

The previous prime is 163791113. The next prime is 163791137. The reversal of 163791117 is 711197361.

163791117 is a `hidden beast` number, since 1 + 637 + 9 + 1 + 1 + 17 = 666.

It is not a de Polignac number, because 163791117 - 2² = 163791113 is a prime.

It is a super-3 number, since 3×163791117³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163791113) 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 in 11 ways as a sum of consecutive naturals, for example, 1299867 + ... + 1299992.

It is an arithmetic number, because the mean of its divisors is an integer number (22532120).

Almost surely, 2^163791117 is an apocalyptic number.

It is an amenable number.

163791117 is a deficient number, since it is larger than the sum of its proper divisors (106594323).

163791117 is a wasteful number, since it uses less digits than its factorization.

163791117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2599872 (or 2599869 counting only the distinct ones).

The product of its digits is 7938, while the sum is 36.

The square root of 163791117 is about 12798.0903653631. The cubic root of 163791117 is about 547.1378777616.

The spelling of 163791117 in words is "one hundred sixty-three million, seven hundred ninety-one thousand, one hundred seventeen".