161941830 has 64 divisors (see below), whose sum is σ = 424839168. Its totient is φ = 39329280.

The previous prime is 161941823. The next prime is 161941903. The reversal of 161941830 is 38149161.

It is a junction number, because it is equal to n+sod(n) for n = 161941791 and 161941800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10689 + ... + 20931.

It is an arithmetic number, because the mean of its divisors is an integer number (6638112).

Almost surely, 2^161941830 is an apocalyptic number.

161941830 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 161941830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212419584).

161941830 is an abundant number, since it is smaller than the sum of its proper divisors (262897338).

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

161941830 is a wasteful number, since it uses less digits than its factorization.

161941830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10301.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 161941830 is about 12725.6367227734. The cubic root of 161941830 is about 545.0709219490.

The spelling of 161941830 in words is "one hundred sixty-one million, nine hundred forty-one thousand, eight hundred thirty".