161851044 has 48 divisors (see below), whose sum is σ = 400467200. Its totient is φ = 50733216.

The previous prime is 161851009. The next prime is 161851051. The reversal of 161851044 is 440158161.

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 15 ways as a sum of consecutive naturals, for example, 29139 + ... + 34245.

Almost surely, 2^161851044 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 161851044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200233600).

161851044 is an abundant number, since it is smaller than the sum of its proper divisors (238616156).

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

161851044 is a wasteful number, since it uses less digits than its factorization.

161851044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5272 (or 5270 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 161851044 is about 12722.0691713259. The cubic root of 161851044 is about 544.9690457407.

The spelling of 161851044 in words is "one hundred sixty-one million, eight hundred fifty-one thousand, forty-four".