211449511477 has 2 divisors, whose sum is σ = 211449511478. Its totient is φ = 211449511476.

The previous prime is 211449511447. The next prime is 211449511561. The reversal of 211449511477 is 774115944112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153653024196 + 57796487281 = 391986^2 + 240409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211449511477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211449511417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105724755738 + 105724755739.

It is an arithmetic number, because the mean of its divisors is an integer number (105724755739).

Almost surely, 2^211449511477 is an apocalyptic number.

It is an amenable number.

211449511477 is a deficient number, since it is larger than the sum of its proper divisors (1).

211449511477 is an equidigital number, since it uses as much as digits as its factorization.

211449511477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 46.

The spelling of 211449511477 in words is "two hundred eleven billion, four hundred forty-nine million, five hundred eleven thousand, four hundred seventy-seven".