161684193 has 24 divisors (see below), whose sum is σ = 245145600. Its totient is φ = 94605280.

The previous prime is 161684179. The next prime is 161684203. The reversal of 161684193 is 391486161.

It is not a de Polignac number, because 161684193 - 2¹⁶ = 161618657 is a prime.

It is a super-2 number, since 2×161684193² = 52283556532122498, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (161684113) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2848 + ... + 18206.

It is an arithmetic number, because the mean of its divisors is an integer number (10214400).

Almost surely, 2^161684193 is an apocalyptic number.

It is an amenable number.

161684193 is a deficient number, since it is larger than the sum of its proper divisors (83461407).

161684193 is a wasteful number, since it uses less digits than its factorization.

161684193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15413 (or 15402 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 161684193 is about 12715.5099386537. The cubic root of 161684193 is about 544.7817132162.

The spelling of 161684193 in words is "one hundred sixty-one million, six hundred eighty-four thousand, one hundred ninety-three".