197839033681 has 3 divisors (see below), whose sum is σ = 197839478473. Its totient is φ = 197838588890.

The previous prime is 197839033591. The next prime is 197839033747. The reversal of 197839033681 is 186330938791.

It is a happy number.

The square root of 197839033681 is 444791.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 186330938791 = 263 ⋅708482657.

It is a de Polignac number, because none of the positive numbers 2^k-197839033681 is a prime.

It is a super-2 number, since 2×197839033681² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197839093681) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 222396 + ... + 667186.

Almost surely, 2^197839033681 is an apocalyptic number.

197839033681 is the 444791-st square number.

197839033681 is the 222396-th centered octagonal number.

It is an amenable number.

197839033681 is a deficient number, since it is larger than the sum of its proper divisors (444792).

197839033681 is an frugal number, since it uses more digits than its factorization.

197839033681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889582 (or 444791 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 58.

The spelling of 197839033681 in words is "one hundred ninety-seven billion, eight hundred thirty-nine million, thirty-three thousand, six hundred eighty-one".