197317002721 has 4 divisors (see below), whose sum is σ = 208923885252. Its totient is φ = 185710120192.

The previous prime is 197317002719. The next prime is 197317002763. The reversal of 197317002721 is 127200713791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127200713791 = 23 ⋅5530465817.

It can be written as a sum of positive squares in 2 ways, for example, as 159628216225 + 37688786496 = 399535^2 + 194136^2 .

It is a cyclic number.

It is not a de Polignac number, because 197317002721 - 2¹ = 197317002719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197317002121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5803441240 + ... + 5803441273.

It is an arithmetic number, because the mean of its divisors is an integer number (52230971313).

Almost surely, 2^197317002721 is an apocalyptic number.

It is an amenable number.

197317002721 is a deficient number, since it is larger than the sum of its proper divisors (11606882531).

197317002721 is a wasteful number, since it uses less digits than its factorization.

197317002721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11606882530.

The product of its (nonzero) digits is 37044, while the sum is 40.

The spelling of 197317002721 in words is "one hundred ninety-seven billion, three hundred seventeen million, two thousand, seven hundred twenty-one".