161941842 has 40 divisors (see below), whose sum is σ = 365359500. Its totient is φ = 53610336.

The previous prime is 161941823. The next prime is 161941903. The reversal of 161941842 is 248149161.

It can be written as a sum of positive squares in 2 ways, for example, as 158986881 + 2954961 = 12609^2 + 1719^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161941797 and 161941806.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 20784 + ... + 27492.

Almost surely, 2^161941842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161941842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182679750).

161941842 is an abundant number, since it is smaller than the sum of its proper divisors (203417658).

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

161941842 is a wasteful number, since it uses less digits than its factorization.

161941842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6872 (or 6863 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 161941842 is about 12725.6371942626. The cubic root of 161941842 is about 545.0709354124.

The spelling of 161941842 in words is "one hundred sixty-one million, nine hundred forty-one thousand, eight hundred forty-two".