197670217 has 4 divisors (see below), whose sum is σ = 198073296. Its totient is φ = 197267140.

The previous prime is 197670199. The next prime is 197670233. The reversal of 197670217 is 712076791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 712076791 = 197 ⋅3614603.

It is a cyclic number.

It is not a de Polignac number, because 197670217 - 2⁷ = 197670089 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 197670217.

It is not an unprimeable number, because it can be changed into a prime (197670017) 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, 200803 + ... + 201784.

It is an arithmetic number, because the mean of its divisors is an integer number (49518324).

Almost surely, 2^197670217 is an apocalyptic number.

It is an amenable number.

197670217 is a deficient number, since it is larger than the sum of its proper divisors (403079).

197670217 is an equidigital number, since it uses as much as digits as its factorization.

197670217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403078.

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

The square root of 197670217 is about 14059.5240673360. The cubic root of 197670217 is about 582.5238971696.

The spelling of 197670217 in words is "one hundred ninety-seven million, six hundred seventy thousand, two hundred seventeen".