840101876909 has 2 divisors, whose sum is σ = 840101876910. Its totient is φ = 840101876908.

The previous prime is 840101876891. The next prime is 840101876947. The reversal of 840101876909 is 909678101048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 496571083684 + 343530793225 = 704678^2 + 586115^2 .

It is a cyclic number.

It is not a de Polignac number, because 840101876909 - 2²⁸ = 839833441453 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840101876969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420050938454 + 420050938455.

It is an arithmetic number, because the mean of its divisors is an integer number (420050938455).

Almost surely, 2^840101876909 is an apocalyptic number.

It is an amenable number.

840101876909 is a deficient number, since it is larger than the sum of its proper divisors (1).

840101876909 is an equidigital number, since it uses as much as digits as its factorization.

840101876909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 53.

The spelling of 840101876909 in words is "eight hundred forty billion, one hundred one million, eight hundred seventy-six thousand, nine hundred nine".