197243561 has 8 divisors (see below), whose sum is σ = 209194944. Its totient is φ = 185573520.

The previous prime is 197243551. The next prime is 197243567. The reversal of 197243561 is 165342791.

197243561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 197243561 - 2¹⁰ = 197242537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (197243567) 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, 68891 + ... + 71696.

It is an arithmetic number, because the mean of its divisors is an integer number (26149368).

Almost surely, 2^197243561 is an apocalyptic number.

It is an amenable number.

197243561 is a deficient number, since it is larger than the sum of its proper divisors (11951383).

197243561 is a wasteful number, since it uses less digits than its factorization.

197243561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140671.

The product of its digits is 45360, while the sum is 38.

The square root of 197243561 is about 14044.3426688471. The cubic root of 197243561 is about 582.1044842191.

The spelling of 197243561 in words is "one hundred ninety-seven million, two hundred forty-three thousand, five hundred sixty-one".