211172197 has 2 divisors, whose sum is σ = 211172198. Its totient is φ = 211172196.

The previous prime is 211172189. The next prime is 211172231. The reversal of 211172197 is 791271112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205091041 + 6081156 = 14321^2 + 2466^2 .

It is a cyclic number.

It is not a de Polignac number, because 211172197 - 2³ = 211172189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211172107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105586098 + 105586099.

It is an arithmetic number, because the mean of its divisors is an integer number (105586099).

Almost surely, 2^211172197 is an apocalyptic number.

It is an amenable number.

211172197 is a deficient number, since it is larger than the sum of its proper divisors (1).

211172197 is an equidigital number, since it uses as much as digits as its factorization.

211172197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1764, while the sum is 31.

The square root of 211172197 is about 14531.7651026983. The cubic root of 211172197 is about 595.4960879257.

The spelling of 211172197 in words is "two hundred eleven million, one hundred seventy-two thousand, one hundred ninety-seven".