197642181 has 16 divisors (see below), whose sum is σ = 294493248. Its totient is φ = 116860800.

The previous prime is 197642177. The next prime is 197642201. The reversal of 197642181 is 181246791.

It is not a de Polignac number, because 197642181 - 2² = 197642177 is a prime.

It is a super-2 number, since 2×197642181² = 78124863420873522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197642111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71686 + ... + 74391.

It is an arithmetic number, because the mean of its divisors is an integer number (18405828).

Almost surely, 2^197642181 is an apocalyptic number.

197642181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

197642181 is a deficient number, since it is larger than the sum of its proper divisors (96851067).

197642181 is a wasteful number, since it uses less digits than its factorization.

197642181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146132.

The product of its digits is 24192, while the sum is 39.

The square root of 197642181 is about 14058.5269854277. The cubic root of 197642181 is about 582.4963556539.

It can be divided in two parts, 19764 and 2181, that added together give a triangular number (21945 = T₂₀₉).

The spelling of 197642181 in words is "one hundred ninety-seven million, six hundred forty-two thousand, one hundred eighty-one".