3871645807213 has 2 divisors, whose sum is σ = 3871645807214. Its totient is φ = 3871645807212.

The previous prime is 3871645807151. The next prime is 3871645807219. The reversal of 3871645807213 is 3127085461783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2825552559844 + 1046093247369 = 1680938^2 + 1022787^2 .

It is a cyclic number.

It is not a de Polignac number, because 3871645807213 - 2¹⁷ = 3871645676141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3871645807219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1935822903606 + 1935822903607.

It is an arithmetic number, because the mean of its divisors is an integer number (1935822903607).

Almost surely, 2^{3871645807213} is an apocalyptic number.

It is an amenable number.

3871645807213 is a deficient number, since it is larger than the sum of its proper divisors (1).

3871645807213 is an equidigital number, since it uses as much as digits as its factorization.

3871645807213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6773760, while the sum is 55.

The spelling of 3871645807213 in words is "three trillion, eight hundred seventy-one billion, six hundred forty-five million, eight hundred seven thousand, two hundred thirteen".