871213813 has 2 divisors, whose sum is σ = 871213814. Its totient is φ = 871213812.

The previous prime is 871213799. The next prime is 871213831. The reversal of 871213813 is 318312178.

Together with next prime (871213831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 710862244 + 160351569 = 26662^2 + 12663^2 .

It is a cyclic number.

It is not a de Polignac number, because 871213813 - 2²⁹ = 334342901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871213873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435606906 + 435606907.

It is an arithmetic number, because the mean of its divisors is an integer number (435606907).

Almost surely, 2^871213813 is an apocalyptic number.

It is an amenable number.

871213813 is a deficient number, since it is larger than the sum of its proper divisors (1).

871213813 is an equidigital number, since it uses as much as digits as its factorization.

871213813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 34.

The square root of 871213813 is about 29516.3312930317. The cubic root of 871213813 is about 955.0840319686.

The spelling of 871213813 in words is "eight hundred seventy-one million, two hundred thirteen thousand, eight hundred thirteen".