161684194 has 8 divisors (see below), whose sum is σ = 277172928. Its totient is φ = 69293220.

The previous prime is 161684179. The next prime is 161684203. The reversal of 161684194 is 491486161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×161684194² = 52283557178859272, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 5774422 + ... + 5774449.

It is an arithmetic number, because the mean of its divisors is an integer number (34646616).

Almost surely, 2^161684194 is an apocalyptic number.

161684194 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

161684194 is a deficient number, since it is larger than the sum of its proper divisors (115488734).

161684194 is a wasteful number, since it uses less digits than its factorization.

161684194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11548880.

The product of its digits is 41472, while the sum is 40.

The square root of 161684194 is about 12715.5099779757. The cubic root of 161684194 is about 544.7817143393.

The spelling of 161684194 in words is "one hundred sixty-one million, six hundred eighty-four thousand, one hundred ninety-four".