161887198 has 8 divisors (see below), whose sum is σ = 264906360. Its totient is φ = 73585080.

The previous prime is 161887181. The next prime is 161887211. The reversal of 161887198 is 891788161.

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, 3679233 + ... + 3679276.

It is an arithmetic number, because the mean of its divisors is an integer number (33113295).

Almost surely, 2^161887198 is an apocalyptic number.

161887198 is a deficient number, since it is larger than the sum of its proper divisors (103019162).

161887198 is a wasteful number, since it uses less digits than its factorization.

161887198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7358522.

The product of its digits is 193536, while the sum is 49.

The square root of 161887198 is about 12723.4900086415. The cubic root of 161887198 is about 545.0096207936.

The spelling of 161887198 in words is "one hundred sixty-one million, eight hundred eighty-seven thousand, one hundred ninety-eight".