211813249 has 2 divisors, whose sum is σ = 211813250. Its totient is φ = 211813248.

The previous prime is 211813229. The next prime is 211813309. The reversal of 211813249 is 942318112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208080625 + 3732624 = 14425^2 + 1932^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211813249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211813249.

It is not a weakly prime, because it can be changed into another prime (211813229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105906624 + 105906625.

It is an arithmetic number, because the mean of its divisors is an integer number (105906625).

Almost surely, 2^211813249 is an apocalyptic number.

It is an amenable number.

211813249 is a deficient number, since it is larger than the sum of its proper divisors (1).

211813249 is an equidigital number, since it uses as much as digits as its factorization.

211813249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 31.

The square root of 211813249 is about 14553.8053099524. The cubic root of 211813249 is about 596.0980584645.

The spelling of 211813249 in words is "two hundred eleven million, eight hundred thirteen thousand, two hundred forty-nine".