84261291871 has 2 divisors, whose sum is σ = 84261291872. Its totient is φ = 84261291870.

The previous prime is 84261291869. The next prime is 84261291899. The reversal of 84261291871 is 17819216248.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84261291871 - 2¹ = 84261291869 is a prime.

Together with 84261291869, 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 (84261291841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42130645935 + 42130645936.

It is an arithmetic number, because the mean of its divisors is an integer number (42130645936).

Almost surely, 2^84261291871 is an apocalyptic number.

84261291871 is a deficient number, since it is larger than the sum of its proper divisors (1).

84261291871 is an equidigital number, since it uses as much as digits as its factorization.

84261291871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 49.

The spelling of 84261291871 in words is "eighty-four billion, two hundred sixty-one million, two hundred ninety-one thousand, eight hundred seventy-one".