211302506489 has 2 divisors, whose sum is σ = 211302506490. Its totient is φ = 211302506488.

The previous prime is 211302506449. The next prime is 211302506509. The reversal of 211302506489 is 984605203112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206032472464 + 5270034025 = 453908^2 + 72595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211302506489 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (211302506449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105651253244 + 105651253245.

It is an arithmetic number, because the mean of its divisors is an integer number (105651253245).

Almost surely, 2^211302506489 is an apocalyptic number.

It is an amenable number.

211302506489 is a deficient number, since it is larger than the sum of its proper divisors (1).

211302506489 is an equidigital number, since it uses as much as digits as its factorization.

211302506489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 211302506489 in words is "two hundred eleven billion, three hundred two million, five hundred six thousand, four hundred eighty-nine".