84271356109 has 2 divisors, whose sum is σ = 84271356110. Its totient is φ = 84271356108.

The previous prime is 84271356083. The next prime is 84271356131. The reversal of 84271356109 is 90165317248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79259140900 + 5012215209 = 281530^2 + 70797^2 .

It is a cyclic number.

It is not a de Polignac number, because 84271356109 - 2²⁵ = 84237801677 is a prime.

It is a super-2 number, since 2×84271356109² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84271356209) 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, 42135678054 + 42135678055.

It is an arithmetic number, because the mean of its divisors is an integer number (42135678055).

It is a 1-persistent number, because it is pandigital, but 2⋅84271356109 = 168542712218 is not.

Almost surely, 2^84271356109 is an apocalyptic number.

It is an amenable number.

84271356109 is a deficient number, since it is larger than the sum of its proper divisors (1).

84271356109 is an equidigital number, since it uses as much as digits as its factorization.

84271356109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 84271356109 in words is "eighty-four billion, two hundred seventy-one million, three hundred fifty-six thousand, one hundred nine".