161871017 has 24 divisors (see below), whose sum is σ = 204492288. Its totient is φ = 125421120.

The previous prime is 161871007. The next prime is 161871029. The reversal of 161871017 is 710178161.

It is not a de Polignac number, because 161871017 - 2⁴ = 161871001 is a prime.

It is a super-2 number, since 2×161871017² = 52404452289228578, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161871007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 188453 + ... + 189309.

It is an arithmetic number, because the mean of its divisors is an integer number (8520512).

Almost surely, 2^161871017 is an apocalyptic number.

It is an amenable number.

161871017 is a deficient number, since it is larger than the sum of its proper divisors (42621271).

161871017 is a wasteful number, since it uses less digits than its factorization.

161871017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109 (or 1098 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 32.

The square root of 161871017 is about 12722.8541216191. The cubic root of 161871017 is about 544.9914618644.

It can be divided in two parts, 161 and 871017, that added together give a palindrome (871178).

The spelling of 161871017 in words is "one hundred sixty-one million, eight hundred seventy-one thousand, seventeen".