211441409 has 2 divisors, whose sum is σ = 211441410. Its totient is φ = 211441408.

The previous prime is 211441397. The next prime is 211441429. The reversal of 211441409 is 904144112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173001409 + 38440000 = 13153^2 + 6200^2 .

It is a cyclic number.

It is not a de Polignac number, because 211441409 - 2²⁴ = 194664193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211441429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105720704 + 105720705.

It is an arithmetic number, because the mean of its divisors is an integer number (105720705).

Almost surely, 2^211441409 is an apocalyptic number.

It is an amenable number.

211441409 is a deficient number, since it is larger than the sum of its proper divisors (1).

211441409 is an equidigital number, since it uses as much as digits as its factorization.

211441409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 211441409 is about 14541.0250326447. The cubic root of 211441409 is about 595.7490357060.

The spelling of 211441409 in words is "two hundred eleven million, four hundred forty-one thousand, four hundred nine".