871801213 has 2 divisors, whose sum is σ = 871801214. Its totient is φ = 871801212.

The previous prime is 871801211. The next prime is 871801237. The reversal of 871801213 is 312108178.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 499388409 + 372412804 = 22347^2 + 19298^2 .

It is a cyclic number.

It is not a de Polignac number, because 871801213 - 2¹ = 871801211 is a prime.

Together with 871801211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871801211) 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, 435900606 + 435900607.

It is an arithmetic number, because the mean of its divisors is an integer number (435900607).

Almost surely, 2^871801213 is an apocalyptic number.

It is an amenable number.

871801213 is a deficient number, since it is larger than the sum of its proper divisors (1).

871801213 is an equidigital number, since it uses as much as digits as its factorization.

871801213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 871801213 is about 29526.2800399915. The cubic root of 871801213 is about 955.2986330666.

The spelling of 871801213 in words is "eight hundred seventy-one million, eight hundred one thousand, two hundred thirteen".