211452441509 has 2 divisors, whose sum is σ = 211452441510. Its totient is φ = 211452441508.

The previous prime is 211452441479. The next prime is 211452441523. The reversal of 211452441509 is 905144254112.

It is a happy number.

211452441509 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., 162492028609 + 48960412900 = 403103^2 + 221270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211452441509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211452441559) 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, 105726220754 + 105726220755.

It is an arithmetic number, because the mean of its divisors is an integer number (105726220755).

Almost surely, 2^211452441509 is an apocalyptic number.

It is an amenable number.

211452441509 is a deficient number, since it is larger than the sum of its proper divisors (1).

211452441509 is an equidigital number, since it uses as much as digits as its factorization.

211452441509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57600, while the sum is 38.

The spelling of 211452441509 in words is "two hundred eleven billion, four hundred fifty-two million, four hundred forty-one thousand, five hundred nine".