211505450249 has 2 divisors, whose sum is σ = 211505450250. Its totient is φ = 211505450248.

The previous prime is 211505450183. The next prime is 211505450251. The reversal of 211505450249 is 942054505112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181953433600 + 29552016649 = 426560^2 + 171907^2 .

It is a cyclic number.

It is not a de Polignac number, because 211505450249 - 2³² = 207210482953 is a prime.

Together with 211505450251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211505450549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105752725124 + 105752725125.

It is an arithmetic number, because the mean of its divisors is an integer number (105752725125).

Almost surely, 2^211505450249 is an apocalyptic number.

It is an amenable number.

211505450249 is a deficient number, since it is larger than the sum of its proper divisors (1).

211505450249 is an equidigital number, since it uses as much as digits as its factorization.

211505450249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72000, while the sum is 38.

The spelling of 211505450249 in words is "two hundred eleven billion, five hundred five million, four hundred fifty thousand, two hundred forty-nine".