161707172 has 24 divisors (see below), whose sum is σ = 309560160. Its totient is φ = 73301760.

The previous prime is 161707171. The next prime is 161707177. The reversal of 161707172 is 271707161.

It is a happy number.

It is a super-2 number, since 2×161707172² = 52298418952475168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161707171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11828 + ... + 21524.

It is an arithmetic number, because the mean of its divisors is an integer number (12898340).

Almost surely, 2^161707172 is an apocalyptic number.

It is an amenable number.

161707172 is a deficient number, since it is larger than the sum of its proper divisors (147852988).

161707172 is a wasteful number, since it uses less digits than its factorization.

161707172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10091 (or 10089 counting only the distinct ones).

The product of its (nonzero) digits is 4116, while the sum is 32.

The square root of 161707172 is about 12716.4134880870. The cubic root of 161707172 is about 544.8075206163.

The spelling of 161707172 in words is "one hundred sixty-one million, seven hundred seven thousand, one hundred seventy-two".