197899529881 has 3 divisors (see below), whose sum is σ = 197899974741. Its totient is φ = 197899085022.

The previous prime is 197899529827. The next prime is 197899529911. The reversal of 197899529881 is 188925998791.

The square root of 197899529881 is 444859.

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.

It is not a de Polignac number, because 197899529881 - 2¹³ = 197899521689 is a prime.

It is a super-2 number, since 2×197899529881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 197899529798 and 197899529807.

It is not an unprimeable number, because it can be changed into a prime (197899524881) 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, 222430 + ... + 667288.

It is an arithmetic number, because the mean of its divisors is an integer number (65966658247).

Almost surely, 2^197899529881 is an apocalyptic number.

197899529881 is the 444859-th square number.

197899529881 is the 222430-th centered octagonal number.

It is an amenable number.

197899529881 is a deficient number, since it is larger than the sum of its proper divisors (444860).

197899529881 is an frugal number, since it uses more digits than its factorization.

197899529881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889718 (or 444859 counting only the distinct ones).

The product of its digits is 235146240, while the sum is 76.

The spelling of 197899529881 in words is "one hundred ninety-seven billion, eight hundred ninety-nine million, five hundred twenty-nine thousand, eight hundred eighty-one".