211196571997 has 2 divisors, whose sum is σ = 211196571998. Its totient is φ = 211196571996.

The previous prime is 211196571979. The next prime is 211196572087. The reversal of 211196571997 is 799175691112.

Together with previous prime (211196571979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203341472356 + 7855099641 = 450934^2 + 88629^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211196571997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211196571967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105598285998 + 105598285999.

It is an arithmetic number, because the mean of its divisors is an integer number (105598285999).

Almost surely, 2^211196571997 is an apocalyptic number.

It is an amenable number.

211196571997 is a deficient number, since it is larger than the sum of its proper divisors (1).

211196571997 is an equidigital number, since it uses as much as digits as its factorization.

211196571997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2143260, while the sum is 58.

The spelling of 211196571997 in words is "two hundred eleven billion, one hundred ninety-six million, five hundred seventy-one thousand, nine hundred ninety-seven".