161969198 has 8 divisors (see below), whose sum is σ = 243213192. Its totient is φ = 80898136.

The previous prime is 161969179. The next prime is 161969201. The reversal of 161969198 is 891969161.

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

It is a super-2 number, since 2×161969198² = 52468042201526408, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40865 + ... + 44652.

It is an arithmetic number, because the mean of its divisors is an integer number (30401649).

Almost surely, 2^161969198 is an apocalyptic number.

161969198 is a deficient number, since it is larger than the sum of its proper divisors (81243994).

161969198 is an equidigital number, since it uses as much as digits as its factorization.

161969198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86466.

The product of its digits is 209952, while the sum is 50.

The square root of 161969198 is about 12726.7119869981. The cubic root of 161969198 is about 545.1016256915.

The spelling of 161969198 in words is "one hundred sixty-one million, nine hundred sixty-nine thousand, one hundred ninety-eight".