161749170 has 96 divisors (see below), whose sum is σ = 474203520. Its totient is φ = 39204000.

The previous prime is 161749129. The next prime is 161749171. The reversal of 161749170 is 71947161.

161749170 is a `hidden beast` number, since 161 + 7 + 491 + 7 + 0 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161749171) 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 47 ways as a sum of consecutive naturals, for example, 30195 + ... + 35145.

It is an arithmetic number, because the mean of its divisors is an integer number (4939620).

Almost surely, 2^161749170 is an apocalyptic number.

161749170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161749170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237101760).

161749170 is an abundant number, since it is smaller than the sum of its proper divisors (312454350).

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

161749170 is a wasteful number, since it uses less digits than its factorization.

161749170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4989 (or 4972 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 161749170 is about 12718.0647112680. The cubic root of 161749170 is about 544.8546816779.

The spelling of 161749170 in words is "one hundred sixty-one million, seven hundred forty-nine thousand, one hundred seventy".