161271198 has 24 divisors (see below), whose sum is σ = 381186936. Its totient is φ = 48870000.

The previous prime is 161271191. The next prime is 161271203. The reversal of 161271198 is 891172161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161271191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 407053 + ... + 407448.

It is an arithmetic number, because the mean of its divisors is an integer number (15882789).

Almost surely, 2^161271198 is an apocalyptic number.

161271198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

161271198 is an abundant number, since it is smaller than the sum of its proper divisors (219915738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161271198 is a wasteful number, since it uses less digits than its factorization.

161271198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814520 (or 814517 counting only the distinct ones).

The product of its digits is 6048, while the sum is 36.

The square root of 161271198 is about 12699.2597422054. The cubic root of 161271198 is about 544.3174667121.

The spelling of 161271198 in words is "one hundred sixty-one million, two hundred seventy-one thousand, one hundred ninety-eight".