840081211447 has 2 divisors, whose sum is σ = 840081211448. Its totient is φ = 840081211446.

The previous prime is 840081211441. The next prime is 840081211451. The reversal of 840081211447 is 744112180048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840081211447 - 2¹¹ = 840081209399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840081211441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420040605723 + 420040605724.

It is an arithmetic number, because the mean of its divisors is an integer number (420040605724).

Almost surely, 2^840081211447 is an apocalyptic number.

840081211447 is a deficient number, since it is larger than the sum of its proper divisors (1).

840081211447 is an equidigital number, since it uses as much as digits as its factorization.

840081211447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57344, while the sum is 40.

The spelling of 840081211447 in words is "eight hundred forty billion, eighty-one million, two hundred eleven thousand, four hundred forty-seven".