211545451477 has 2 divisors, whose sum is σ = 211545451478. Its totient is φ = 211545451476.

The previous prime is 211545451417. The next prime is 211545451483. The reversal of 211545451477 is 774154545112.

211545451477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190788998436 + 20756453041 = 436794^2 + 144071^2 .

It is a cyclic number.

It is not a de Polignac number, because 211545451477 - 2³¹ = 209397967829 is a prime.

It is a super-2 number, since 2×211545451477² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211545451417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105772725738 + 105772725739.

It is an arithmetic number, because the mean of its divisors is an integer number (105772725739).

Almost surely, 2^211545451477 is an apocalyptic number.

It is an amenable number.

211545451477 is a deficient number, since it is larger than the sum of its proper divisors (1).

211545451477 is an equidigital number, since it uses as much as digits as its factorization.

211545451477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 784000, while the sum is 46.

Adding to 211545451477 its reverse (774154545112), we get a palindrome (985699996589).

The spelling of 211545451477 in words is "two hundred eleven billion, five hundred forty-five million, four hundred fifty-one thousand, four hundred seventy-seven".