161672194 has 8 divisors (see below), whose sum is σ = 242603388. Its totient is φ = 80804400.

The previous prime is 161672191. The next prime is 161672201. The reversal of 161672194 is 491276161.

It can be written as a sum of positive squares in 2 ways, for example, as 122921569 + 38750625 = 11087^2 + 6225^2 .

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

It is a super-2 number, since 2×161672194² = 52275796625547272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161672191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8857 + ... + 20044.

Almost surely, 2^161672194 is an apocalyptic number.

161672194 is a deficient number, since it is larger than the sum of its proper divisors (80931194).

161672194 is a wasteful number, since it uses less digits than its factorization.

161672194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31700.

The product of its digits is 18144, while the sum is 37.

The square root of 161672194 is about 12715.0381045438. The cubic root of 161672194 is about 544.7682363319.

The spelling of 161672194 in words is "one hundred sixty-one million, six hundred seventy-two thousand, one hundred ninety-four".