171921612 has 48 divisors (see below), whose sum is σ = 432788832. Its totient is φ = 52915200.

The previous prime is 171921593. The next prime is 171921637. The reversal of 171921612 is 216129171.

171921612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 171921612.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2862 + ... + 18762.

It is an arithmetic number, because the mean of its divisors is an integer number (9016434).

Almost surely, 2^171921612 is an apocalyptic number.

171921612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 171921612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216394416).

171921612 is an abundant number, since it is smaller than the sum of its proper divisors (260867220).

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

171921612 is a wasteful number, since it uses less digits than its factorization.

171921612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15978 (or 15976 counting only the distinct ones).

The product of its digits is 1512, while the sum is 30.

The square root of 171921612 is about 13111.8881935441. Note that the first 3 decimals coincide. The cubic root of 171921612 is about 556.0452795103.

The spelling of 171921612 in words is "one hundred seventy-one million, nine hundred twenty-one thousand, six hundred twelve".