211830481 has 2 divisors, whose sum is σ = 211830482. Its totient is φ = 211830480.

The previous prime is 211830467. The next prime is 211830499. The reversal of 211830481 is 184038112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185204881 + 26625600 = 13609^2 + 5160^2 .

It is a cyclic number.

It is not a de Polignac number, because 211830481 - 2¹¹ = 211828433 is a prime.

It is a super-2 number, since 2×211830481² = 89744305361382722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211830461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105915240 + 105915241.

It is an arithmetic number, because the mean of its divisors is an integer number (105915241).

Almost surely, 2^211830481 is an apocalyptic number.

It is an amenable number.

211830481 is a deficient number, since it is larger than the sum of its proper divisors (1).

211830481 is an equidigital number, since it uses as much as digits as its factorization.

211830481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 211830481 is about 14554.3973080303. The cubic root of 211830481 is about 596.1142231493.

Adding to 211830481 its reverse (184038112), we get a palindrome (395868593).

The spelling of 211830481 in words is "two hundred eleven million, eight hundred thirty thousand, four hundred eighty-one".