197181681 has 8 divisors (see below), whose sum is σ = 263017440. Its totient is φ = 131400192.

The previous prime is 197181671. The next prime is 197181713. The reversal of 197181681 is 186181791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 197181681 - 2⁹ = 197181169 is a prime.

It is a super-2 number, since 2×197181681² = 77761230643971522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (197181671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4155 + ... + 20288.

It is an arithmetic number, because the mean of its divisors is an integer number (32877180).

Almost surely, 2^197181681 is an apocalyptic number.

It is an amenable number.

197181681 is a deficient number, since it is larger than the sum of its proper divisors (65835759).

197181681 is a wasteful number, since it uses less digits than its factorization.

197181681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27135.

The product of its digits is 24192, while the sum is 42.

The square root of 197181681 is about 14042.1394737412. The cubic root of 197181681 is about 582.0436045081.

The spelling of 197181681 in words is "one hundred ninety-seven million, one hundred eighty-one thousand, six hundred eighty-one".