161271117 has 48 divisors (see below), whose sum is σ = 278403840. Its totient is φ = 88010496.

The previous prime is 161271109. The next prime is 161271127. The reversal of 161271117 is 711172161.

It is not a de Polignac number, because 161271117 - 2³ = 161271109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161271127) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 187753 + ... + 188609.

It is an arithmetic number, because the mean of its divisors is an integer number (5800080).

Almost surely, 2^161271117 is an apocalyptic number.

It is an amenable number.

161271117 is a deficient number, since it is larger than the sum of its proper divisors (117132723).

161271117 is a wasteful number, since it uses less digits than its factorization.

161271117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002 (or 999 counting only the distinct ones).

The product of its digits is 588, while the sum is 27.

The square root of 161271117 is about 12699.2565530428. The cubic root of 161271117 is about 544.3173755825.

The spelling of 161271117 in words is "one hundred sixty-one million, two hundred seventy-one thousand, one hundred seventeen".