161209198 has 8 divisors (see below), whose sum is σ = 256038192. Its totient is φ = 75863136.

The previous prime is 161209189. The next prime is 161209211. The reversal of 161209198 is 891902161.

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

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, 2370690 + ... + 2370757.

It is an arithmetic number, because the mean of its divisors is an integer number (32004774).

Almost surely, 2^161209198 is an apocalyptic number.

161209198 is a deficient number, since it is larger than the sum of its proper divisors (94828994).

161209198 is a wasteful number, since it uses less digits than its factorization.

161209198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4741466.

The product of its (nonzero) digits is 7776, while the sum is 37.

The square root of 161209198 is about 12696.8184203760. The cubic root of 161209198 is about 544.2477042891.

The spelling of 161209198 in words is "one hundred sixty-one million, two hundred nine thousand, one hundred ninety-eight".