197538317 has 4 divisors (see below), whose sum is σ = 209158236. Its totient is φ = 185918400.

The previous prime is 197538281. The next prime is 197538323. The reversal of 197538317 is 713835791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 96314596 + 101223721 = 9814^2 + 10061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197538317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197538337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5809934 + ... + 5809967.

It is an arithmetic number, because the mean of its divisors is an integer number (52289559).

Almost surely, 2^197538317 is an apocalyptic number.

197538317 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

197538317 is a deficient number, since it is larger than the sum of its proper divisors (11619919).

197538317 is a wasteful number, since it uses less digits than its factorization.

197538317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11619918.

The product of its digits is 158760, while the sum is 44.

The square root of 197538317 is about 14054.8325141213. The cubic root of 197538317 is about 582.3943008492.

The spelling of 197538317 in words is "one hundred ninety-seven million, five hundred thirty-eight thousand, three hundred seventeen".