172161197 has 16 divisors (see below), whose sum is σ = 197998080. Its totient is φ = 148478400.

The previous prime is 172161191. The next prime is 172161217. The reversal of 172161197 is 791161271.

172161197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 172161197 - 2⁶ = 172161133 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172161191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4322 + ... + 19052.

It is an arithmetic number, because the mean of its divisors is an integer number (12374880).

Almost surely, 2^172161197 is an apocalyptic number.

It is an amenable number.

172161197 is a deficient number, since it is larger than the sum of its proper divisors (25836883).

172161197 is a wasteful number, since it uses less digits than its factorization.

172161197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14804.

The product of its digits is 5292, while the sum is 35.

The square root of 172161197 is about 13121.0211873924. The cubic root of 172161197 is about 556.3034558399.

The spelling of 172161197 in words is "one hundred seventy-two million, one hundred sixty-one thousand, one hundred ninety-seven".