161811196 has 12 divisors (see below), whose sum is σ = 292304320. Its totient is φ = 78295680.

The previous prime is 161811179. The next prime is 161811281. The reversal of 161811196 is 691118161.

161811196 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

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, 652341 + ... + 652588.

Almost surely, 2^161811196 is an apocalyptic number.

It is an amenable number.

161811196 is a deficient number, since it is larger than the sum of its proper divisors (130493124).

161811196 is a wasteful number, since it uses less digits than its factorization.

161811196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304964 (or 1304962 counting only the distinct ones).

The product of its digits is 2592, while the sum is 34.

The square root of 161811196 is about 12720.5029774770. The cubic root of 161811196 is about 544.9243179705.

The spelling of 161811196 in words is "one hundred sixty-one million, eight hundred eleven thousand, one hundred ninety-six".