211445197 has 2 divisors, whose sum is σ = 211445198. Its totient is φ = 211445196.

The previous prime is 211445191. The next prime is 211445207. The reversal of 211445197 is 791544112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202379076 + 9066121 = 14226^2 + 3011^2 .

It is a cyclic number.

It is not a de Polignac number, because 211445197 - 2¹¹ = 211443149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211445191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105722598 + 105722599.

It is an arithmetic number, because the mean of its divisors is an integer number (105722599).

Almost surely, 2^211445197 is an apocalyptic number.

It is an amenable number.

211445197 is a deficient number, since it is larger than the sum of its proper divisors (1).

211445197 is an equidigital number, since it uses as much as digits as its factorization.

211445197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 34.

The square root of 211445197 is about 14541.1552842269. The cubic root of 211445197 is about 595.7525933250.

The spelling of 211445197 in words is "two hundred eleven million, four hundred forty-five thousand, one hundred ninety-seven".