171861156 has 96 divisors (see below), whose sum is σ = 477052800. Its totient is φ = 53343360.

The previous prime is 171861133. The next prime is 171861191. The reversal of 171861156 is 651168171.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 171861156.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 124486 + ... + 125858.

It is an arithmetic number, because the mean of its divisors is an integer number (4969300).

Almost surely, 2^171861156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 171861156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238526400).

171861156 is an abundant number, since it is smaller than the sum of its proper divisors (305191644).

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

171861156 is a wasteful number, since it uses less digits than its factorization.

171861156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1466 (or 1458 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 171861156 is about 13109.5826020511. The cubic root of 171861156 is about 555.9800943480.

The spelling of 171861156 in words is "one hundred seventy-one million, eight hundred sixty-one thousand, one hundred fifty-six".