172161100 has 36 divisors (see below), whose sum is σ = 374288544. Its totient is φ = 68735680.

The previous prime is 172161079. The next prime is 172161103. The reversal of 172161100 is 1161271.

It is not an unprimeable number, because it can be changed into a prime (172161103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66429 + ... + 68971.

It is an arithmetic number, because the mean of its divisors is an integer number (10396904).

Almost surely, 2^172161100 is an apocalyptic number.

172161100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172161100 is an abundant number, since it is smaller than the sum of its proper divisors (202127444).

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

172161100 is a wasteful number, since it uses less digits than its factorization.

172161100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3234 (or 3227 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 172161100 is about 13121.0174910332. The cubic root of 172161100 is about 556.3033513613.

The spelling of 172161100 in words is "one hundred seventy-two million, one hundred sixty-one thousand, one hundred".