211380439 has 2 divisors, whose sum is σ = 211380440. Its totient is φ = 211380438.

The previous prime is 211380437. The next prime is 211380457. The reversal of 211380439 is 934083112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211380439 - 2¹ = 211380437 is a prime.

Together with 211380437, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211380439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211380437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105690219 + 105690220.

It is an arithmetic number, because the mean of its divisors is an integer number (105690220).

Almost surely, 2^211380439 is an apocalyptic number.

211380439 is a deficient number, since it is larger than the sum of its proper divisors (1).

211380439 is an equidigital number, since it uses as much as digits as its factorization.

211380439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 211380439 is about 14538.9283993010. The cubic root of 211380439 is about 595.6917679729.

The spelling of 211380439 in words is "two hundred eleven million, three hundred eighty thousand, four hundred thirty-nine".