172161198 has 24 divisors (see below), whose sum is σ = 406926936. Its totient is φ = 52170000.

The previous prime is 172161191. The next prime is 172161217. The reversal of 172161198 is 891161271.

172161198 is a `hidden beast` number, since 17 + 21 + 611 + 9 + 8 = 666.

172161198 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172161191) 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, 434553 + ... + 434948.

It is an arithmetic number, because the mean of its divisors is an integer number (16955289).

Almost surely, 2^172161198 is an apocalyptic number.

172161198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

172161198 is an abundant number, since it is smaller than the sum of its proper divisors (234765738).

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

172161198 is a wasteful number, since it uses less digits than its factorization.

172161198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869520 (or 869517 counting only the distinct ones).

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

The square root of 172161198 is about 13121.0212254992. The cubic root of 172161198 is about 556.3034569170.

The spelling of 172161198 in words is "one hundred seventy-two million, one hundred sixty-one thousand, one hundred ninety-eight".