39811821811 has 2 divisors, whose sum is σ = 39811821812. Its totient is φ = 39811821810.

The previous prime is 39811821787. The next prime is 39811821821. The reversal of 39811821811 is 11812811893.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39811821811 - 2⁷ = 39811821683 is a prime.

It is not a weakly prime, because it can be changed into another prime (39811821821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19905910905 + 19905910906.

It is an arithmetic number, because the mean of its divisors is an integer number (19905910906).

Almost surely, 2^39811821811 is an apocalyptic number.

39811821811 is a deficient number, since it is larger than the sum of its proper divisors (1).

39811821811 is an equidigital number, since it uses as much as digits as its factorization.

39811821811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 43.

The spelling of 39811821811 in words is "thirty-nine billion, eight hundred eleven million, eight hundred twenty-one thousand, eight hundred eleven".