197999213 has 8 divisors (see below), whose sum is σ = 200358648. Its totient is φ = 195646464.

The previous prime is 197999183. The next prime is 197999227. The reversal of 197999213 is 312999791.

It can be written as a sum of positive squares in 4 ways, for example, as 9815689 + 188183524 = 3133^2 + 13718^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 197999213 - 2¹⁰ = 197998189 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 (197999233) 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 7 ways as a sum of consecutive naturals, for example, 81545 + ... + 83937.

It is an arithmetic number, because the mean of its divisors is an integer number (25044831).

Almost surely, 2^197999213 is an apocalyptic number.

It is an amenable number.

197999213 is a deficient number, since it is larger than the sum of its proper divisors (2359435).

197999213 is an equidigital number, since it uses as much as digits as its factorization.

197999213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3343.

The product of its digits is 275562, while the sum is 50.

The square root of 197999213 is about 14071.2193146152. The cubic root of 197999213 is about 582.8468961000.

The spelling of 197999213 in words is "one hundred ninety-seven million, nine hundred ninety-nine thousand, two hundred thirteen".