172161120 has 48 divisors (see below), whose sum is σ = 542309040. Its totient is φ = 45909504.

The previous prime is 172161107. The next prime is 172161127. The reversal of 172161120 is 21161271.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172161127) 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 7 ways as a sum of consecutive naturals, for example, 178855 + ... + 179814.

It is an arithmetic number, because the mean of its divisors is an integer number (11298105).

Almost surely, 2^172161120 is an apocalyptic number.

172161120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172161120 is an abundant number, since it is smaller than the sum of its proper divisors (370147920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172161120 is a wasteful number, since it uses less digits than its factorization.

172161120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358687 (or 358679 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 172161120 is about 13121.0182531692. The cubic root of 172161120 is about 556.3033729033.

It can be divided in two parts, 17216 and 1120, that added together give a triangular number (18336 = T₁₉₁).

The spelling of 172161120 in words is "one hundred seventy-two million, one hundred sixty-one thousand, one hundred twenty".