197561881 has 8 divisors (see below), whose sum is σ = 224892864. Its totient is φ = 171792720.

The previous prime is 197561851. The next prime is 197561887. The reversal of 197561881 is 188165791.

197561881 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 not a de Polignac number, because 197561881 - 2¹¹ = 197559833 is a prime.

It is a super-2 number, since 2×197561881² = 78061393648516322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197561887) 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, 390186 + ... + 390691.

It is an arithmetic number, because the mean of its divisors is an integer number (28111608).

Almost surely, 2^197561881 is an apocalyptic number.

197561881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

197561881 is a deficient number, since it is larger than the sum of its proper divisors (27330983).

197561881 is a wasteful number, since it uses less digits than its factorization.

197561881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780911.

The product of its digits is 120960, while the sum is 46.

The square root of 197561881 is about 14055.6707773055. The cubic root of 197561881 is about 582.4174575273.

The spelling of 197561881 in words is "one hundred ninety-seven million, five hundred sixty-one thousand, eight hundred eighty-one".